Wanted to get some kind of gps mainly just for accurate speed display. Bought a refurb megellon tritan 400 handheld, no printed manual, gotta go on line, directions are mumbo jumbo to this geezer, phoned help #, they couldn't hardly speak English and had no knowledge of product so I returned it. Can any one recommend a resonable priced product that will give accurate speed? (and easy to figure out how to use)