I would like to have a good quality GPS on a budget for exploring mountain bike trail systems so I know where I am and where to turn. Tracking is not that important to me, or other buzzes and whistles. A huge screen is not that important to me, but large enough so I can see things from a handlebar mount. I would like to be able to use it at night when I ride at night with a headlight. I don't want some kind of monthly subscription for maps, if i can prevent it. I suppose it would be nice to be able to upload maps to it without having to tether it to a computer...but I assume those units are pricier and have wifi or something. I would also consider using my iphone with a garmin mount case so if you can recommend an app as opposed to a GPS unit, I'm all ears. I wouldn't be using my phone or a GPS for every ride...like once I get to know a new trail system and know my way around, I won't use the GPS or phone again until I need it for a new trail system I've never been to before.

Thanks!