I team uses several of the combo GPS/two-way radios. I don't remember the model, but when I'm using them again in a few weeks, I'll make note.
What I can tell you is that both the GPS and radio functions seem to work okay, but we don't use them in any long range distances.
Each radio uses 3 AA batteries and if we don't shut off the GPS, the radios drain fresh alksline Duracell and Energizer batteries fairly quick.
Also, I cannot confirm that the radios are water tight. I cannot recall if there is a weather radio feature.