This is a report on an issue of the Garmin GPSMAP 67 in which we observe a huge drift of the location it indicates when the device is stationary (i.e. does not move). It seems to occur more often when satellite reception conditions are not optimal. Typical real life situations in which this occurs are when you pause during a hike in the forest or during Geocaching. Next picture shows the coordinate as recorded by the device overnight when placed stationary at the window. At the start the location is indicated correctly (green symbol). Then the logged coordinate starts wandering throughout the village where I live. A power cycle of the device immediately resolves the problem: the coordinate indicated jumps back to where it is supposed to be. This indicates it is a software error that can be resolved.
This image has been taken from the Garmin Connect website. An investigation has been made into the problem. This document reports on the findings.