Garmin GPSMAP 64st compass failure in GPS Posted October 27, 2015 I have a Garmin GPSMAP 64st and was out geocaching yesterday. Everything was working fine until I got to a cache and the compass went haywire. The distance to destination bounced around from 150 ft-0 ft. The map worked just fine I could zoom in and out and it would take me to the spot. I then turned the unit off and on then recalibrated the compass and still the same. When I went off geocaching mode the compass works just fine. I checked for an update but nothing new. Has anyone else had any issues and what if any is the fix. Mine is only about 2 months old. I have had a similar compass problem on my 62ST once during trekking (no geocaching mode). Calibration did not help, neither turning GPS off and on. But changing/removing the batteries helped. The problem have not turned up again since then.