Both these units have a 3v backup battery inside and need replacing each 6 to 10 years. In LNAV is just goes crazy in data readout so open case and slip in a 2032 which is available at the checkout of Wollies for about $3.50. The original is now hard to find (try tandy)
The GPS NAV can be checked at startup and should be replaced it below 2.8v BUT you have to have it powered up from 12 volts while you change the battery. The battery is under the antenna or plate on top AND DOES NOT LOOSE ATHE SEAL when you undo these 2 screws. If you let it get below 2.3v you will loose the electronuc seal. While on LNAV please check your digital ASI and compare it to Winter ASI and if out readjust with the off sets per the manual - THIS SHOULD BE CHECKED each FORM2 Do this and no more probs for years
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