I'm very much a map and compass navigator and have never seriously used a GPS but in planning a trip to Colorado this year it is becoming increasingly apparent that I'm going to spend a lot of time wrestling with unfamiliar maps in areas I have no knowledge of (and may get shot/eaten if I stray from the trail) and I'd also rather not spoil the flow of the trails.
Would anybody be able to recommend a GPS unit that will allow me to follow a pre-programmed course/route, will work over here and in the US, and provide appropriate grid references for a paper map? Ideally I'd like one that will mount on the bike, give altitude and also show a map, but giving me directions and coordinates are the main criteria.
Being a proper outdoor unit (waterproof, shockproof, etc) and taking standard size batteries would also be a help for emergencies rather than USB charging or non-removable battery. I'm not bothered about updating my position to MyTwitFaceTubeBook, Strava based willy-waving or other electronic frippery, I want a solid navigational device first and foremost.
Please tell me what I need to know,
Much obliged in advance,