Question about Lowrance LMS-332C GPS Receiver

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Can't read depth at high speeds (>20 mph)

I have a problem where I lose the reading for depth at high speed on my LMS-337. I have checked the position of the externally mounted transducer and it is set perfectly (like the manual recommends). Somebody suggested a solution that the transducer would move and that would cause it to fail. Do they mean move permanently out of position or do they mean vibrate while running at high speed? Mine stays pretty much put in the same position.

Thanks,

Carlos

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  • billtong Feb 01, 2009

    I have the same problem with my 520 LMS.

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SOURCE: depth finder problem

Try adjusting the trim or get the boats nose up even to the point of porpoise (I think thats how you spell it) if the signal improves with the nose up you may need to lower the transducer more than the manufacturer recommends. the slight looking foward will also help. My current sounder works pretty well up to about 25kn

Posted on Jul 03, 2007

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I have a garmin gpsmap 440s that will only read sonar depths a no wake speed. When I increase speed much past this the depth number blinks but does not track or change until I slow back down to idle again....


Sounds like the transducer is installed at the wrong angle or in such a way that it is getting a lot of air from something on the hull. If it is a transom mount, check that it is angled correctly and not too close to the motor or aft of some kind of thru-hull fitting that will cause turbulence.

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I wonder if the module has failed again, have you tried reseting the device?

I'm looking into this but I suspect that repairs are required again.

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How do i get a reading just for speed and depth on


If you have no chart card for your local area, you definitely need one! As far as getting various data on the screen, as long as it is available on the system, you can display different kinds of data by pressing the "data" button and then following the steps to add data to your readout.

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Hello- My 332c will not show speed. It worked before.The spinner wheel is not damaged.Speed just flashes 0.00 mph Thanks, Jeff


Try setting up the speed in the overlay data menu again:
1. Press MENU, arrow down to OVERLAY DATA and press ENT
2. Highlight the option for speed (WATER SPEED or GROUND SPEED) and press ENT
3. Highlight the REMOVE button and press ENT
4. Highlight (PRESS ENT TO ADD) and press ENT
5. Arrow down to SONAR DATA and press ENT
6. Arrow down to WATER SPEED and press ENT, a check will be displayed in the box
7. Press EXIT twice

If the speed is still flashing, the data is still invalid. Try resetting the unit completely:
1. Turn unit off
2. Press and hold the PAGES and POWER key until the "DO NOT RELY..." alarm appears
3. Set up the overlay data for speed again: 1. Press MENU, arrow down to OVERLAY DATA and press ENT; 2. Highlight (PRESS ENT TO ADD) and press ENT; 3. Arrow down to SONAR DATA and press ENT; 4. Arrow down to WATER SPEED and press ENT, a check will be displayed in the box; 5. Press EXIT twice

If the speed is still flashing, good chance the speed sensor is bad even though the wheel still spins. Install the latest LMS-332 updates from http://www.lowrance.com/en/Products/Marine/Full-Size-SonarGPS-Chartplotter-Combos/LMS-332C/Downloads/LMS-332C-Software-Update/ and set up the overlay data again.

If it turns out that the speed sensor is bad, just use speed from the GPS. This can be set up from the overlay data menu as GROUND SPEED.

(note: the overlay data must be set up for each page individually. So if you set up speed to be displayed on the map screen, it will not also be set up on the sonar page)

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1 Answer

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Depending on your transducer type, you may have a liquid filled type that simply needs refilling. If this is the case check for leaks and get it redone. If not it could be transducer placement or cavitation under the hull.

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Log and trip function not registering


It is unlikely the problem is in the A65 screen.....most likely it is an issue with the paddlewheel itself, its circuit in the depth/speed transducer, or least likely, in the DSM25 sounder module.

Both the log and the trip functiions are read from the paddle-wheel sensor of the connected DSM25 sounder module and transducer.

1. Make sure you have a DSM25 sounder module and transducer with a paddle wheel (the A65 is available without the DSM25 option.)

Double check the connections between the DSM25 and the A65, as well as the transducer connection to the A65. There is an indicator light on the DSM25 to confirm it is on.

2. Make sure the paddle wheel turns freely. They tend to get fouled easily with debris and growth.

3. Make sure the A65 is giving to a reading for SPEED when underway or when having a buddy spin the paddlewheel by hand. Do not confuse SPEED with SOG. SPEED is from the paddlewheel.....SOG (Speed over ground) comes from your GPS sensor and is not used by A65 for log or trip purposes.

If you get npo speed reading at all the paddle wheel may be defective or the depth/speed transducer may be defective. See your dealer about a replacement.

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1 Answer

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Depth: Could be for a number of reasons, too deep for the sounder - check the manual for it's max depth. Dirty water, sounder unable to penetrate through to the bottom. Weed or other debris covering the transducer. Transducer on a swing mount & being pushed out of alignment then dropping back in once stopped.

Speed: Is the speed readout controlled by a GPS or paddlewheel? If it's GPS, check the power connection of the sounder, may be loose which would also cause the depth to 'drop out'. If it's paddlewheel, you're down to bad connections or faulty unit.

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1 Answer

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reset your factory settings!

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2 Answers

Depth finder problem


The problem is not so much the flat bottom, although they are prone to this problem. The way the sonic waves have to travel through the water is affected by turbulence, especially by air bubbles and cavitation, and by the transducer actually leaving the water, which happens frequently on flat bottomed boats. The best solution to this is to have the unit mounted through the hull so it is completely flush with the hull surface - often they are mounted with a surface flange on the outside of the hull which although thin still causes cavitation around the transducer at higher speeds. about 14 knots will usually interfere with the accuracy of the readings on most hull shapes - forward looking sonars perform usually better. Another thing to check is that the transducer is actually seating right in the housing, if it is not flush with the flange then you have problems - even half a millimetre is too much. check no muppet has painted the transducer with antifouling paint - that never helps, also check if there is a build up of marine growth on or near the transducer - a smooth hull will always keep your depth working until a higher boat speed. if the transducer is growing stuff itself then gently scrape it off - be really careful not to scratch the surface. There are now available non-sonic depth sounders, especially ulf radio signal devices, but I have heard no good reports about them, last i saw they were very expensive and maybe they experience other problems at high speed. there also have been towed devices available that may suit your needs better, although probably a lot of trouble in shallow waters. If you can borrow a waterproof video camera, you could mount it behind (not too close) the transducer, this would be a pain to do, but it may give you an insight into what part of the hull if any is causing the problem (tie the camera to the top of the boat securely in case the mount fails) Hope this helps, sorry but your dealer is not totally wrong :)

Sep 25, 2006 | Lowrance M68C GPS Receiver

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