google earth caches it's data
so if you scroll around your flying field at home (at various zoom levels, all you need on the field), you are able to use that area without internet connection
-> no need for internet on the field
If you use the Mission Planner and pre-load the map at home, it will remain cached at the field.
Otherwise, I tether my Nexus S (Android) phone. I used to have EVDO built into my laptop but now that I've got the Nexus I don't need it anymore.
Thats awesome Michael! Thank you for all your hard work. I am amazed at the rate in which you are able to provide us with updates.