I use an app called iHike GPS. Downloaded all the topo maps for the areas I hunt and it switches to them automatically when you are in the area. Location is locked on almost instantly, unlike other GPS's I have owned. Keep it in a clear waterproof pouch with a decent case and protective tempered glass screen cover. And also carry a powerbank that gives at least 3 full charges.
In fiordland I used a cheap solar charger instead of the powerbank and it lasted the whole 10 days, even with listening to a bit of music while stuck in the tent for 48 hours.
I only really use the GPS for marking good spots and lookouts and checking it to see how far away I am from a track or other destination.
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