So this is not just another GPS accuracy post, I'm hoping to identify a specific scenario I don't think this watch is currently handling well. The scenario is the typical overpass or tunnel scenario where the device loses signal, then regains on the other side. I've noticed since I've had this watch (about 12 runs) the 645 Music is particularly bad. I ran with my wife this morning on my typical route which contains several overpasses back to back. Each time through (out-and-back) my watch added at least .10 miles and overestimated the pace.
I assume other people are seeing this as well? Hopefully Garmin will be able to address this through software updates. I noticed since DCR is in Austrailia he didn't do his typical tunnel scenario so I'm not sure he caught this. I've been running for years almost daily on this same route have not had problems with my 920xt handling these overpasses.
Below is a specific example from today:
My 645M file, even had a footpod which should help: https://connect.garmin.com/modern/activity/2561435288
Wife's FR220 comparison file: https://connect.garmin.com/modern/activity/2561402412
Other examples of 645M bad GPS handling from previous days (note problem occurs at about the 1.4 mile mark in, then again on the return):
https://connect.garmin.com/modern/activity/2559968360
https://connect.garmin.com/modern/activity/2546059214
Examples of 920xt where it handles this same section well (note I'm not just picking out the best, just the most recent):
https://connect.garmin.com/modern/activity/2515997958
https://connect.garmin.com/modern/activity/2500804964
Edit: I should note that outside of this scenario the accuracy seems very good. ciq.forums.garmin.com/.../1323609.jpg
