On the iPad it is MotionX GPS and several and other Apps who are able to download satellite images for offline usage, under Android there are Locus Pro and AlpineQuest GPS.
Want to say that we are able now to use offline Satellite Images. But wich provider has the best quality of images? This kind of Navigation is helpful abroad, where you don't have any road gps coverage. Because of this i had select an area in Cameroon in africa as comparison spot.
At first i start with Bing Satellite-Hybrid view, what means with road overlay. Here i could zoom more tham showed here, it allows me to detect Villages and too single Houses.
Bing Maps |
As next i try Google. The resolutions is maxed out here - no chance to see single houses.
Google Maps |