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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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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Depth display


reset your factory settings!

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