Yes, it is Mapdroyd, not Mapdroid - sorry about mispelling. Mapdroyd is pretty impressive in many ways, but it is based on openstreetmaps that is open/volunteer source. Its coverage does not include Africa, the Middle East, China, etc - really limited to Europe, N/S America, and all the maps and the app are free. In many ways it's better for browsing maps than the name-brands such as CoPilot, and it does use satellite location data. Has no search or driving directions, so is limited.
I had enough space on my Jetstream internal sd card, so I was able to install all the maps with a bit of space left over (about 5 gb), but I'd prefer using the external card, so I left a message with Mapdroyd but haven't received any answer so far.
I've looked at OruxMaps but my impression is the maps are user-created, chiefly from topo maps, which I'd rather not get involved in.