The OSM street maps have pretty good detail from what I see locally and as the 810 map screen is zoomable, you can see where you are as well as what's around reasonably well, IMO.

I stumbled into the whole GPS idea as a result of discovering the Garmin Swim Watch, which counts pool laps and ports the workout to Garmin Connect. I had been tracking rides, but not doing pre-routing, with Endomondo, which is bloody awful for swimming as it can only track tenths of a mile. So useless for swimming but the iPhone app worked well for cycling. Then I would pre check route options on RideWithGPS, but this site and MapMyFitness either don't log swimming or don't do it well and it's a manual entry in any event.

So then I found the watch and Connect and it worked well for an easy workout upload (the swim watch is a pretty good device). Thus I got sucked into the Connect and bought the 810. As well, I find course creation in Connect online, then porting via Connect Mobile on the iPhone via BT to be very good and a reliable and painless transfer.

Thing is, the 810 (and 520) and in theory, work very well when they work, which is pretty much most of the time. Until it doesn't, but right now not much else seems any more reliable. And once you go down the Connect/Connect Mobile/BT route its hard to go back as as a system it's pretty good IMO. I'm just hoping I've discovered the tricks and fixed the bugs (like a badly formatted SD card). I'm being a bit more patient (or stupid) then Drew I like to think and am plodding on.