They would be good for bush walking with your mates or family, but of limited use for a bike. You need a GPS, that you can at least see clearly, if not hear.
My experience with the UHF is that a hand held doesnt work so well, the in car sets are much better. I was able to talk to Ray over a distance of about 10 Ks, even though he is having some problems.
The Rhino is a bit of a compromise of both GPS and UHF..
And we dont compromise, do we......