Yes. You download maps you want to use and after that all you need is GPS service. I highly recommend doing that all the time because if you do not and your cell service is spotty, your tracking can lock up. In offline mode (downloaded maps) you never have an issue.Does this Gaia service require using a cellphone? I like that my separate GPS device just has the OnX chip inserted into it and so I don't have to use my phone for that stuff. Does this Gaia service have an offline option like that? Where you can DL what you need and be able to run it and work with it without cell service and without using a cellphone?