So I know there's been some previous discussions here concerning the accuracy of GPS data vs. bike computers for keeping track of mileage. I'm having some weird irregularities with mine and I'm wondering if anyone can offer an explanation... Here are the two scenarios...
1) Yesterday I volunteered over in Clearwater for the Ironman Tri, it was all road miles so I figured the GPS and bike comp would be very close. GPS recorded 21.49 miles whereas the bike comp reported 25.0. In this scenario I believe the GPS is accurate and the bike comp is high for some reason.
2) This morning I did a loop at Morris Bridge. This was my route... Parked at Trout Creek... Bayshore to Coconut Grove, crossed over to HIF, took Gator Bait to Indian to Washboard to Heartbreak Ridge. Followed the double track out to the river overlook, stopped for a break. Took main up to Eubanks Pkwy to the Y, continued on main and took it back to my car at Trout Creek. Forgot to turn my GPS off, realized it as I was crossing the bridge leaving Trout Creek, so would expect it to be about a mile high. GPS recorded 24.16, bike comp recorded 16.0. In this scenario I believe the bike comp is accurate and the GPS is way high for some reason.
GPS logger is set to record a waypoint every second, have it set this way to avoid the squaring off of round curves when mapping.
Anyone have any explanation for this?