Originally Posted by
Steve B.
My Garmin 810 has US GPS only, no GLONASS. I've never noticed.
The 810 boots up and finds satellites pretty quick in my experience and tracks a road ride very close. or at least the track as viewed on Connect after the ride is dead on. I've seen repeated accuracy of about 6/10 of a mile per 100 as compared to a calibrated Cateye wireless cycling computer.
I had heard that riding in deep woods can make any GPS inaccurate, GPS or GLONASS, so I use a speed sensor on my mt. bike.
If you could find an 800 or 810 cheap enough, they work well as well. Or the Lezyne units are good deals.
Refurbished 800s are $170 with new case, new battery, and Garmin warranty.
The software is much more reliable than the 810 I crashed that within the first day, and lost data in the week I had it before returning it and getting an 810.
The 800 doesn't do bluetooth of any sort, always has left/menu/right showing on the bottom line so the text is a little smaller than the 810, and has bike profiles with individual odometers. Otherwise it's effectively the same as the 810.