Originally Posted by
cashmonee
This is not entirely true. There is a mapping site (I believe it is ridewithgps) that will tell you to turn. It is an overlay that pops up, much like the lap time overlay, or auto pause overlay you see. I have only tested it around my neighborhood (and it was several months ago), and it worked decently well. The command to turn came on AT the turn, not before. That was the only real issue. Maybe in the months since I have used it they have fixed that. Not saying it is on the level of what the 800 has, or that it is even that great, but it is there if you need it. I find, in general, I don't need turn-by-turn where I ride.
EDIT: Here is ridewithgps tips and tricks for the 500.
http://ridewithgps.com/edge_500
Good point. I have used BikeRouteToaster to create TCX courses and it does similar. It automatically puts in a turn warning a fixed distance before a turn and at the turn (which is really too late) but it just says there's a turn, not the direction or the name of the road. I'll have to try RWGPS...