Looking to get a GPS for my bike and wondering whether I should go for a Garmin 800 or 810. I definitely want the maps, so that rules out the 500 series, but can't see why the 810 is so much more expensive than the 800? I know it has Bluetooth, but I assume there must be more to it than that to justify the quite significant increase in price?
I will be looking to get the Performance pack, so will be using it with HRM and cadence sensors, but I won't be using power sensors. It will be for road use only.
Any help much appreciated.