How do you charge it when in the field?
That would be my only concern.....running out of juice.
They are no different than your cell phone or flashlight......you need to keep an eye on how much power you have left and plan accordingly.
In the field I can use any USB battery pack to charge up my Garmin InReach mini but it uses hardly any power anyhow so I can use it for weeks/months without needing to charge it at all. When it starts to get low I charge it back up at home over night and your good to go.
Granted, I don't run mine tracking continuously when I'm out in the field and if you do you will certainly need to charge more often. Some of the new fancy GPS units with the color LCD screens and other features use much more power but it is what it is.....charge it up when you need to.
There is no reason to run out of power with your GPS unit if you do your homework and have your act together just like there is no reason to run out of gas in your truck...........
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