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Hi Fredrick, I own a garmin navman and to update it I just connect it through USB to my computer, The link below is a youtube video that might be worth a look at as well as a few video's down the right side might interest you as well, I hope this helps mate.......CHEERS'' My Nextar GPS running Garmin
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)