There is a great free app for iPhone and Android that you should consider using while out in the wilderness.
It will let you download many free maps from their website, and even use your own that you had created using a map building service, like CalTopo. (I had described this process in a previous post, which I has linked below).
I use it on my iPhone while hiking, and it uses the GPS, so I can even use this while out of cell phone reception.
it is a great tool to help you explore areas, and will let you know if you drift off your trail, and can help you get back on course.
It’s also very simple to use….if you can use Google Maps, you can use Avenza.
I recommend you give it a try on your next adventure.