Losing track points over about 110 km/h / 70 mph

[lordsutch]

I've looked over the forum and can't find anyone else who's reported a similar problem. I got my GPSMAP 66sr a few months ago and have noticed that it does a very good job of recording tracks when set to record a point every second. However, in a moving vehicle once the speed reaches or exceeds about 110 km/h, gaps start appearing in the track, sometimes around 5 seconds or so but at other times the gaps can be 20 to 40 seconds or more. I tried cutting the recording rate to every other second and the problem still is present, although it seems a little bit less frequent. The issue also arises with recording both GPX and FIT format tracks. This problem did not arise with my old eTrex 20x. Any ideas?

[GPSrChive]

Would need to look at an unedited track from your device before we could make any suggestions.