I have used the collector app for over a year now. One of the things that I have noticed is that if I don't have cell phone or wifi access, I can't access my "on device" maps. I just get the spiral of death and no maps show up. this summer I will be traveling with my HS students to South Africa to collect data on wildlife movements in the Sabi Sands area, near Kruger National Park and we may at times not have access to either while we are out in the field. We are lucky this year that our camp has wifi access so in the morning we can access our maps before we go out into the field. However next year, we may not have the luxury from the start. We will always have access provided we go to the lodge but that can be more than 2 km away. Great for eventual syncing but not great way to have to go 2km to find our maps. I am wondering if anybody else has had this problem. I would love to know if I am missing something. Please let me know. If you don't know what I am talking about, please try this by finding a poor cell phone reception spot and try to access your "on device" map and see if you experience the same thing. I want to work this out before we leave this year on June 30th.