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I use a Garmin Oregon with topo maps. It also lets you overlay custom maps easily (like game maps with objectives, boundaries and stuff marked on it.)
Its older technology and the UI feels sluggish compared to the ultra responsive screens/GPS apps on today's smartphones (the screen brightness in sunlight also leaves something to be desired); but it runs on AAs, is waterproof and most of the earlier models are discontinued now and can be bought used for fairly cheap. Its also hard (almost impossible?) to get a good topo map for smartphone apps and there's only one good "off road" GPS app I've found to date. So I'm still using the Oregon.
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