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I couldn't find anything that met my needs when it comes to outdoor gps so im going to build one. my requirements are extreme power efficiency and battery life, and small size. I literally just want a screen that does nothing but display my gps coordinates and can navigate to a few way points. I bought some stuff from adafruit and I'm going to build it. it will have an eink screen that will update with my position every ten seconds, and a compass, so it can display an arrow pointing at a waypoint if I press a button. I have a 3d printer so I can make a case. total cost $65.