Thats where onX maps allows you to download the maps of areas you want to hunt before goong out in the woods. Then you don't need the cellular network. Most smart phines have a GPS chip on board so it will track you without the cellular network. It is very accurate to.
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Does the "Randy" code still get you 30% off?
I use onX on my phone and consider it worth the money for sure. That said, if you're tight on cash, fishnfur is certainly right that you can live without it. The same information is available various places if you're willing to do the research. Or you can pay onX for the convenience

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Don't forget you can pick up the phone and call the state bios and land managers in the area. Folks will always complain about government, but coming from Alabama I've found the state WDFW and land mgmt folks to be super helpful.