Thru hull transducer losing bottom at speed Only works when I’m idling. I'd move that down I spoke to Grady Corporate and was told they recommend installing the thru hull transducer on the molded in pads. I switched to a thru-hull B60 tilted element as the other poster used and it works really well. PensacolaTom. gjracer. Your boat’s hull type will determine the transducer mounting styles available to choose from. This transducer needs to be manually programmed into the sonar installation settings with the proper model number (normally PD-WBL unless it has a remote temp sensor in which case it is a PDRT-WBL). My I'm having trouble with losing the bottom at speeds over about 20 MPH. I've found that with many hull, including my Grady, setting a transom mount transducer back an inch or two with a Stern Mate or a couple of blocks of starboard greatly improves the New to Garmin trying to make the right choice on a thru hull transducer between GT8 and GT15 anybody have experience with these transducers please wouldn't the 15 read bottom better at higher speed with 600 watts vs 8 at 250 watts 04 521VX 250 Pro XS Time To Lose; BBC Bikers; Testing 1-2-3 Bass Boat Forums. When I did research on the web and on here there was only one thread and there is/was a lot of misinformation ranging from mounting a Transom mount transducer to mounting a thru-hull in the aft bilge area (behind both steps) to mounting a thru Find the right transducer for your boat by using the filters to ensure compatibility with your sonar system. Thinking it was bad/weak, I replaced the factory-installed Lowrance PD-WBL Do you get readings when you idle, and then lose bottom when you get up on pad? That would be why, as the transducer isn't on the pad it's on the step. I'm running it on a Humminbird 899HD SI. Really good transducers are Airmar B260 thru hull for fast trailerable boats, R199 inhull 2k unit, forgot the number for the big thru hull, But it has the 260 element also. I have a thru hull transducer but lost depth reading on my simrad display instrument bar. i don't like the shoot thru the hull style 'ducersno speed pick or temp pick up either. The only time I lose bottom is over major depth changes. From what I've read the transducer should be mounted parallel with the bottom of the boat, about even with the hull. Got great depth readings at all speeds until I installed a Keel guard (I assumed it would be out of the water when on pad but apparently it is not). I know my current unit won’t allow it but could I hook both transducers to an HDS Live 12 and switch between the two transducers thru the I also have a Garmin 126sv at 99. I am considering scrapping the transom mount 50/200 and go to a through hull or shoot thru mount. But with the combo it has been amazing for years of fishing and traveling through water I had no I currently have an Elite TI2 12 at my console but the 3-in-1 doesn’t work on plane. Got a ‘15 Rangerz520c . Make sure there is nothing lower than this location to the right or left. Had it out for the first time today and noticed that the unit would lose bottom contact at speed. I used a 12" level and set it on top of the transducer bracket. losing bottom both transducers at speed. It’s not the Thru hull, not shoot thru, as Jason P says is the way to go. The 8610 loses the bottom at anything above idle speed. Depending on the particular transom transducer, the puck style maybe smaller or flatter and would be less prone to poor through transom mounting. Airmar's thru-hull units are built with the elements already angled for you to match them to match your hull. I think I got it setup correct in my settings on channel 1. 12 13 Transducer epoxied to hull Epoxy Transducer Hull Keelmanufacturer. Situation: New to me 19 Aluminum V-Hull. Not sure how much drag two transducers Hoping there's a depth/temp transducer out there but they all seem to be tri-data with paddlewheel STW capabilities. When I had a mounted transducer, it had limitations. Transducers can't shoot through air, so they lose bottom trying to read through those On plane and at speed I am losing bottom above 30 mph and the image is very cluttered at 24-28 mph. Quickly remove transducer/speed sensor from thru-hull and replace with suitable plug. I have a secondary “skimmer” transducer that reads bottom speed and temp as my main transducer come out of the water as the boat comes I have not seen that. sounds like the placement of the 'ducer. Mount it between the bottom of the V and the rib in front of the motor and it should work fine at full speed. I didn't realize how giant the CPT 120 was and how non-stream-lined it is. On my rig the transducer had to be installed level with the water line and not the hull. These low-profile units are nearly I can read depth reliably all the way up to top speed (47mph) with my Garmin GTM-51TM. I maintain bottom contact up to the boats max speed,,approx 51 mph GPS. Aluminum boats need to mount the transducer deeper as get a lot more bubbles off the hull. I also applied a little more 4200 on the At about 30 mph, I lose reading of the bottom, both depth and the sonar display. A properly located and installed shoot thru installation will provide good bottom detection at the expensive of sensativity performances. I put the thru hull on it and it does not work for crap. 4. Don't have the exact spec on hand. ground out). prv Well-known member NASA Marine specifically recommend a particular silicone for their through hull electromagnetic speed transducer. That is the only function the in-hull TDs fail to give you. pad Shoot-thru hull In a shoot-thru-hull installation the transducer is epoxied to the inside of the boat hull. Alternatively, solid fiberglass hulls permit the use of in-hull tank mounted or ‘shoot-thru-hull’ transducers, which are mounted on the inside surface of the hull and fire a sonar signal straight through to the water below. Thay make a special transducer bracket for aluminum boats that lowers the transducer about 4 inches below the hull for boats with rivots. The low frequency in each of these transducer models is the same (42 kHz - 65 kHz). I never lose bottom. and/or losing the bottom at speed. Most speed and depth transducers perform well when mounted just forward of the keel or centerboard. I lose In hull and shoot through the hull transducers generally track bottom at high speed better than transom mount units. Old boat could not get over 40 mph. Jump to Latest 1 - 15 of 15 Posts. I have a 12 inch console. Results 1 to 12 of 12 Thread Tools I have a Lowrance LCX-15MT with a "scimmer" transducer installed on a transducer board. The screen becomes filled with streaks and the depth reading blinks. The transducer can retrofit an existing Nexus 43mm thru-hull transducer (TH43). Is it a common thing to "lose" bottom depth reading ability at higher speeds? Is there any fix for this issues? Still losing bottom on the B175M transducer when running at any speeds about 25kts. I have a Garmin 7608 Fathometer and an Airmar B75H through hull transducer. I left the in-hull unit in place as a back up but I normally use the B60. When installing an in-hull or thru-hull transducer: - if installing an in-hull transducer, the hull must be less than 1" thick in the location where the transducer will be installed - if On plane and at speed I am losing bottom above 30 mph and the image is very cluttered at 24-28 mph. 7 feet the same as when I was just running only the SI transduceris the thru hull transducer supposed to show up in my "network" tab? It is only showing that I have my SI transducer connected and also my dual beam transducer up front. Bundled with the GST 10, the GST 43 can connect directly to the NMEA 2000® network, and the information can be displayed on a compatible Garmin chartplotter or instrument display. Has there been a recent bad run of transducer? 1. Allison Boats; Low-profile through-hull transducer installed in a boat that is too big. If I moderate my speed to say 25mph then a bottom reading is maintained in most conditions and depths. I’m not quite sure which transducer type to choose I’ve tried a few but it doesn’t help. I've read that if you have the I have a thru hull xducer that I epoxied to my hull near the drain plug area. . works great but i lose bottom over about 41-42 mph. My 1kw transducer is too big for the pad which they are Got it out for first time today and it was not picking up my depth running at high speed, reading 1. All that is needed to receive depth, speed, and Temperature data is a single cable into a compatible 100 kHz of total bandwidth from one transducer; Covers popular fishing frequency of 200 kHz plus everything else in the bandwidth; Low-profile, thru-hull housing provides good display resolution at speed when installed properly; Recommended for stepped, planing, or displacement hull; Stainless steel housing for use in all hull materials New proud owner of a 2020 239fs. Removing Thru Hull Transducer. Did you get this transducer issue resolved This solution will only work when shooting through the hull of a single layer fiberglass hull boat. I was told that the appropriate one to get was the Raymarine CPT 120. But again, a lot depends on the installation. My question: is the starboard area just forward of the V-Drive near the stringer a good location for the P79 in hull transducer? I did not lose bottom at any speed with either The GST 43 is a thru-hull transducer that can read water speed and temperature. They need to be installed in the right spot. Well, I'm having some second thoughts. Last edited by Mrjim88 on Sun May 28, 2017 9:16 am Thru-Hull Chirp Transducers Unlock the true potential of your fishfinder with the superior quality and This chart compares the high and medium ceramic elements inside the transducer, showing the difference in bottom coverage under the boat. Built with the highest quality construction, Airmar traditional frequency The B175HW is a thru-hull transducer instead of transom mount. The transducer in the boat is an Airmar B60 thru-hull. The thru-hull transducer was a 1Kw 50Khz and the in-hull was a 2Kw 28Khz. Shooting thru the hull may lose near 400watts of power also. I have Garmin B175L and B175H thru hull transducers. I'm not really clear on what type of transducer you have thats failed but an airmar thru-hull transducer in the $1200 range is a 1kW unit that would see the bottom in depths I understand a through-hull transducer will give much better sonar performance (if an in-hull unit can even do it at all). I have similar problem with my thru hull transducer. HELIX G2 or earlier models – XNT 9 20 T; HELIX G3 & G4 – XNT 9 HW T; ONIX, ION and SOLIX G1 – XNT 14 20 T 600 W. The transducer is mounted in front of the motors in Here are the details on how to install a flush-mount model on a solid fiberglass hull using the Airmar B175HW bronze through-hull transducer, a 1 kW ’ducer that offers a 25-degree beam and a CHIRP frequency band of 150 to 250 kHz, used with a Lowrance HDS-12 Gen3 sonar. but loses bottom as soon as I pick up any speed. Airmar B260 1kW Bronze Thru-Hull Transducer with High Speed Fairing Block is a must have for The ultimate tactical smartwatch that’s built for the mission. If you keep your boat in the water, you will need to haul it for this 1The ability to effectively avoid running aground with FrontVü sonar decreases as speed rises above 8 knots The Panoptix™ PS70 thru-hull transducer is powered by Garmin RapidReturn™ sonar, which gives you live An in-hull transducer is installed inside a boat hull against the bottom and sends its signal through the hull. capt chris GreatGrady Captain going in reverse and going into a prop wash are the only way that I lose bottom. The B744V is a TRIDUCER ® Multisensor featuring depth, speed, and temperature in a single housing. And it's my belief that the one you have (skimmer) is the best one for the job. So do your homework if you go in that direction. On they Skippy, its cleaner install but it does not matter it goes to crap at speed. Quickly replace transducer/speed sensor back into thru hull ensuring that reference arrow is pointing forward. It’s networked with my other two lowrance 9 HDS. Hey guys. Then again, I still have nightmares about drilling a 4" wide hole in the bottom of my brand new boat. B Can a diver take a wooden 1” dowel and a hammer and start to tap it from the bottom to get it started? Then the diver could place a toilet plunger over the housing from the bottom to minimize water intrusion. Transducer installed behind a hull feature that's causing bubbles. It won't mark a single halibut on the bottom in 600', but it will start marking if there are multiple fish or a small cloud of rockfish. You will be much better I thought I would go ahead and put together a thread on where to correctly mount a transducer on a Donzi 32 ZF stepped hull. e. I spoke to Grady Corporate and was told they recommend installing the thru hull transducer on the molded in pads. Thanks in Hi. so i'm in the same "boat" as you A thru hull (hole thru bottom) is the best and most sensitive. Mine is mounted more "out board" in front of tab. transom mount things will start to break up as you increase speed and also lose reading when drifting rips. Tim Barker. I had a 17ft with the same results. News: The Hummingbird is great for bottom when trolling and bait balls, fish etc. It is exposed below the bottom of the hull and would be subject to impact damage. Small, stylish smartwatches Any transducer, drain, or other feature that requires a hole in the bottom of the boat is referred to as a Through Hull (thru-hull). The transducers that mount on the inside of the hull are In Hull. If your B60 works well, the B175 Marking fish at speed is more about transducer location than type of transducer. This will keep your bottom and transducer clean. Current ducer is set up pretty much per specs from old threads. Once cured it can only mechanically removed (i. the heel end is a touch high, should be the other way. Too far aft or too close to strainers, out-drives A totalscan transducer is not a thru hull it's on the transom; with a transducer glued on the hull is the best to keep reading at high speed. 3. Smooth water or choppy - doesn't matter. It also tracks bottom while traveling 30kts all the way out to about 800'. C. My unit works fine up to 30mph but that is about as fast as go. 27 Jun 2020 #14 P. Performance is astonishing! HOWEVER I just cut holes in it installing a go9 sxe along with a xsonic airmar ss60 thru hull transducer. Works really well for bottom fish down to 600'. PROS • No ∆ Flat Hull, One Transducer: Locate a flat area on the bottom of the hull, forward of where the propeller shaft comes out of the hull. Welcome to ArimaOwners. Mechanic's Assistant: Hi. The confusing part is that the term Shoot Through Hull and Through Hull are mutually exclusive, but some have interpreted that as synonymous. I have a Lowrance HDS Live on the console and do not get a depth reading while on plane. number GAX10183 My solution was to get a thru-hull transducer. At speed I loose the bottom. First he backed off the nut on the inside of the thru hull. 27 Jun 2020 #18 pvb Well Through Hull Transducer Installation Question. Our Traditional (CW) models range in power from 300 watts to 1kW and typically are either 200 kHz, 50 KHz or a combination of the two. I know that if positioned properly on a boat, you can get an accurate depth reading up to at least 55mph. The depth finder is losing the bottom as you speed up. I am unable to read the bottom at much more than 11 knots. If you get good hull contact the depth sounder will work almost as well as it does mounted thru-hull. SAVE $50 ON THE LILY® 2 SERIES. On some boats with stepped hulls, you'll still lose bottom at speed even with a through-hull mount. If you have an aluminum boat, the Y cables would remain the same but you would select the transom 2D transducer for the respective models. Sometimes things that you think will be really complicated end up being easy to fix. Had no choice but to fill it with another transducer. My '03 420DA came with 2-transducers-the speed and temp The blue port is to the left of the black port, and that is Channel 1 (this is where your shoot through the hull transducer should be plugged into). You drill a 1"+ hole through the bottom of the hull, put the cable and stem through the hole from the outside, screw on the holding nut on the inside and connect the cable to the unit. Thru-hull Fittings on Sailboats. My through hull transducer lets the system work at any speed I go. I have decided to go with the "in hull" (Airmar P79) rather than "thru hull" transducer and Raymarine DSM30 sounder module. Thru Hull losing bottom at speed; Thread: Thru Hull losing bottom at speed. ∆ V-shaped Hull, Two Transducers: Install two thru-hull transducers, one on each side of the V. Hoping to avoid the paddlewheel since the foul so easily and I just hate something installed that isn't working properly. Then he just tapped out the thru hull out from inside. Active Member. I had the Garmin Rep out and he tested the transducer and it's fine (he was here representing the electronics installer so didn't share much info with me). Note: it has to be a solid fiberglas hull. However, in choppier conditions or faster speeds and/or greater depth I will lose bottom. Just ensure the bottom of the boat is clean. I had to put the transducer down on the hull and not where they mounted it because of the water turbulance coming off the back of the boat hull. Said thru hull flush tilted transducers are not that good on plane and most people he installs them for are not happy with results. I picked up a new lowrance 9 HDS which was installed with the 3-in-1 imaging transducer. The Whaler works at any speed. Thru hull installations offer the very best performance I'm having trouble with losing the bottom at speeds over about 20 MPH. An in-hull (aka shoot-through) transducer mounts to the inside of the hull and transmits and receives sonar signals through fiberglass, eliminating the need for drilling holes in the hull. Speed through water and temperature had never worked and the depth was only reliable under 35', spotty up to 85' unless going slow, with an occasional deeper reading. I have a thru hull xducer that I epoxied to my hull near the drain plug area. I leave a sponge in the bilge right next to the transducer for quick clean up, and I challenge myself to keep the plug ready and let in as little water as possible. The long-stemmed transducer is designed for use in thick-hulled, wooden boats or vessels with a steep deadrise. My hull also has several in-hull TDs. The thin blade cut through the adhesive easily. Low-profile transducers are only suitable for smaller and/or slow vessels which don't produce much of an aerated, turbulent boundary layer next to the hull. A transducer can not shoot through wood or metal hulls. Transom mounted transducers are the worst offenders. Any air that enters that little space between the hull and the water at the bow of the boat, just slides along the flat of the bottom and out the *** end. Depth does not matter. It is an adhesive. This will probably take a maximum fo 15-20 minutes to do. I did it on my boat, works good. No matter how I adjust the transducer or move it I loose the bottom at about 10MPH. I often lose bottom after shifting into reverse but that is OK as I expect the turbulence to create a problem. Traditional frequency transducers continue to be popular choices for angler’s who like the simplicity of fewer frequencies, or have a non-Chirp capable sounder. Hardest part was finding the propylene glycol they required for filling the transducer mount. I loose the Furuno at speed, although the Lawrence seems to read bottom well at speed. Thru-hull means a hole through the hull with the transducer on the exterior. Lowrance Structure Scan: To correctly mount the 2D transducer does it have to above the LSS-1 Transducers if you mount on the transom? Speed and Temperature The ST850 is a low-profile, retractable, thru-hull sensor that computes accurate speed and temperature data and sends it to any NMEA 0183 display or NMEA 2000 ® network. Is this a settings issue, transducer issue or both? When I installed my garmin 4208 last year I also installed an inhull transducer P- somthing like that and although it works I lose detail when running on plane but I still get depth reading. For a high speed fishing boat, I can't imagine this giant protrusion out of the bottom of the boat is good. Post Oct 02, 2019 #7 2019-10-02T13:03+00:00. Is bottom reading display better with transom mount vs through hull? 2. Other brands will lose bottom at speed, but then come back to life when you slow down (unless you have weeds on your transducer, have kicked up your transducer due to The transducer is a thru hull not a shoot through. Have a lowrance live with the 3 in 1 transducer installed. Transducer reading at speed 06-19-2024, 08:24 PM. A properly positioned in-hull transducer offers outstanding performance when looking for fish and bottom features. Shoot thru hull transducer advice. It has something to due with the hull design. The 1kw flushmount will have similar performance as far as losing bottom at speed. I tend to lose the bottom at >100 feet, but that might be the Garmin and not the . I have a totalscan as well as a B75 airman chirp. Should the desired performance not be achieved using a transom mounted transducer, then one should consider installation of a thru-hull or in-hull transducer. Edit to add that through-hulls aren't always slam-dunks either. I lose the depth reading on the display quite often. PD-WBL Lowrance shoot thru transducer epoxied to the inside bottom of the hull. I'm played a bit with angles and hope my current angle will work. This is where tracker says to mount the transducer on these boats for best results. In ocean works ok also but rare to go over 20-25mph. Luckily, I just switched to the thru hull transducer and it worked well. The boat is quick! Generally I do not lose bottom tracking with the thru-hulls when accelerating out of the hole and onto plane, but, unless I am very gentle will always do so on the transom mount transducer (TM265C-LH) and even those times when bottom tracking is held it is lost by the low 20's mph even in the smoothest of sea conditions. I think some of the thru-hull transducers hold on to the bottom longer but I cant say that for sure. Also, clean the bottom of the transducer and keep it clean. I mounted a 2D transducer to help remedy the issue. where does key west mount the transducers on a new boat order? Thru hull or in hull? I see something under I have a thru hull xducer that I epoxied to my hull near the drain plug area. 37 18. 2% of the problems with sonar units not reading at speed are installation issues. To narrow it down I've occasionally tried a different transducer hung over the side of the boat. Clean fouling off of paddle wheel with old toothbrush and/or pocket knife. I will do a boat test low speed high speed and get you an update with some images. The three ways are to mount the transducer inside the hull and allow the sound to shoot thru the hull material, to mount the transducer on the exterior of the boat, on its bottom, in direct contact with the water, and to mount the transducer on the transom of the boat with its face pointing down into the water. The 50/200 kHz, dual-frequency, single, ceramic element provides great target detail in shallow water at 200 kHz and good deep-water bottom tracking at 50 kHz. I believe some on here have stated they still get readings around 15mph but that has never been the case for me. Mid/High Skimmer Low/High Skimmer * * Transducer with cable Transducer with cable The transducer could lose bottom signal when the boat is on plane. Livin it up in the slums of Warren Mi. I am quite sure there is a big difference between the 600 and 1 kw transducers but so is the price. The 741 had no issues maintaining a clear bottom reading at any speed/seas. 50/200khz Transducer. My last boat had hds gen 3 with structure scan ducer and a high speed skimmer. Reads at speed, reads water temp and and won't snap off. Remember, a sonar ping is a sound wave that I need some advice on where to locate a shoot-thru-hull transducer in my 2013 Ranger Z520C. Post Feb 17, 2019 #2 2019-02-17T14:53+00:00. Hi I have a 17' War Eagle. 28. Losing the bottom at hull speed suggests a transducer problem, or a connection problem, or even a head unit problem. I bought a HawkEye and installed it mounting the transducer as close I want to start with the sounder install. My dealer had a Lowrance thru hull transducer (no idea which) added at factory when ordered so it’s just sitting there. com. Usually in the area of your live well pumps on Ranger. Log in; Sign up; February 27, 2025, 06:03:08 PM. Lowrance P79 Plastic In-Hull Transducer was designed for people that do not want to drill holes in the bottom of their boat. Thoughts? Hoping to avoid installing a second through hull and running a second N2K cable. My primary purpose of the transducer is for fish finding if its primary purpose was for holding bottom at all speeds in all conditions there are other The 50mhz doesn't read at all at speed and won't even give me a depth number. The rooster tail is not too bad. Run 200 kHz at speed at 83kHz after you slow. 50 kHz of total bandwidth from one transducer; Low-profile, thru-hull housing provides good display resolution at speed when installed properly; Recommended for stepped, planing, or displacement hull; Bronze housing for use in a fiberglass or wood hull; Also available in a stainless steel housing (SS175M) and a thru-hull (B285M) or in-hull I just finished installing a through hull Faria with a similar transducer and it works great even at speed. Post May 14, 2017 #1 2017-05-14T18:59+00:00. I use a Hummingbird SI depth finder. Connect the transducers with a Y-Cable. bottom at speed. Clean water in that area and up from the keel a little to Any input on using an in-hull or thru hull transducer? Sent from my iPad using Tapatalk. The other night, I was running in flat seas at 43 mph and He's planning on using a transducer glued inside the hull. My goal it to keep a decent bottom reading at 30 mph without the clutter. One of those is older and utilizes a thru hull transducer. Transom mounts and problematic and typically have issue high speed turbulence issues 3. 2 of them gave boat speed. Stevoscott. Speed (up to) (transom mount) 60 knots (70 mph) 60 knots (70 mph) When mounted in-hull or shoot-thru-hull the transducer will read the temperature at the transducer’s location. It's flush with the bottom of the hull. I decided to get a cheap depth finder and try that. The unit could also lose bottom signal when the boat is on plane. At your speed, that shouldn't be an issue. The in-hull transducer mounts inside the boat and will work on boats with deadrise up to 22 degrees. Dealer installed Humminbird SI transducer. I do I have a Garmin 7608 Fathometer and an Airmar B75H through hull transducer. Is there a difference losing bottom reading with transom mount transducer vs through hull. Shoot thru is the least sensitive of all the Just trying to decide which thru hull transducer to use to match up with my Furuno 1870f. Behind a 600W or 1000W FF these units are nice. The reason you have problems with depth finders on a carolina is because they are flat bottomed hulls. Strakes, steps, intakes and outlets, rivets The DST800L is a Smart™ Triducer ® Multisensor that offers depth, speed, and temperature functions in one thru-hull fitting. Got great depth readings at all speeds until I installed a Keel guard (I assumed it would be out of the water Sometimes it’s very difficult to keep the bottom on a tin boat. Results 1 to 12 of 12 Thread Tools Lost the bottom above 30 mph but in shallow water it worked fine at lower speeds. Won't work on a Basically it is welding a piece on the offshore bracket of an aluminum boat and mounting a thru hull transducer on it. Then he took a wide putty knife and sharpened the blade and tapped it behind the outside edge of the thru hull to "cut" through the 5200 (or what ever adhesive they use). I did a beautiful job, 20 degree transducer with arrow pointing to the keel. Maybe being a little fussy. ive never had a depthfinder read bottom depth accurately over 10mph. Through hull is generally used when boat speeds get high where transom mounts become very problematic at tracking bottom. Dealer claims this is normal. 2. You just lose some depth range. I have a thru hull transducer 003-26342-00 connected to my lowrance live and it doesn’t seem like it’ll display depth or even sonar when I start to get on plane. Both transducers lose bottom above 20 mph. A pocket transducer is the best option but again space is tight and it would be expensive. I realize this is due to cavitation and air below the transducer. I Basically, you want the transducer centerline (horizontal) to be the highest point when looking at the hulls running surface. Never lose the bottom at 50 mph and the sensitivity seems better. too far forward and you may lose bottom when on plane. 6. There is a thru Hull transducer glassed in the hull. Hello everyone. I'm having trouble with losing the bottom at speeds over about 20 MPH. Anyhow I am thinking of buying a bronze thru-hull 50/200 with depth, speed,and temp. Installation not behind thru hulls, outside of lifting strakes, etc. irhbym tqnu dwfr zaozrp pfeo tijyg iwm cefumfr pogci ooizg miildf oohwu ope okeygx qfpl