I highly recommend Garmin. They have GPS figured out and their customer
support is good (I recommend email, but phone works too). Used Garmins
go for a song. Get a black and white screen if you plan on running off
of batteries. ALL the Garmin's are really good. I have a 195. It is
getting a bit old in the tooth, but does pretty much everything I want,
though it does not have terrain height or antennaes on it. The latest
Garmins do that.