I'm not sure the 705 does topo maps. My issue is that my 705 runs out of juice after 12-15 hours, so I'd have to find a place to recharge it every day, but I expect that to be a problem for all units. The routing isn't that great either, but it is functional. If you are looking to record the data from your ride, it runs out at either 3,4 or 5 hours (I think 4) so you have to hit stop and reset it to get data on your complete ride if going a long way. If you are doing lite touring (motels at night) then I don't see any reason not to use it.