I was on a back pack trip where I downloaded the offline maps the day before I left. The maps and satellite overview worked perfect for 6 days. On the 6 night of the 8 day trip we checked maps and satellite images for the next days plan. When we got up in the morning and went to look at the maps again there was nothing in the layers, no offline maps on base map (base map is absolutely useless in the back country). Has anyone had this issue, do you know how to make sure it does not happen again a while on a trip?