I dislike anything with short battery life when I am out in the boonies. That includes most GPS units...
Most of my nav is printed topo map, and the one concession I make to battery power - altimeter on my Kestrel 2500.
That thing's battery seems to last for years, and the replacement is TINY
I've just invested in a decent analogue altimeter/barometer. Majority of the time in the bush I can't see enough to take decent bearings, so altimeter is much more useful.
Switch my mobile phone to flight mode so the battery lasts several days. Got downloads of the LINZ map images, and use Avenza app to view those with integrated GPS pointer from phone.
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