Currently putting a proposal together for a new client, on the development of a mobile app which will be used in woodlands. Long story short, the primary purpose is to record and upload data but of course, in a woodland, there's limited connectivity.
Most of the data recorded is manually input, or relies on device sensors that will work offline no problem, so for the most part we'd simply store the data locally and upload when there's a connection, no problem at all.
BUT one crucial element will be obtaining the lat/lon value of where the device is at the time this data is recorded. I'm aware that GPS is completely independent of data connectivity, but given both GPS and mobile data connections are essentially the same in terms of being satellite based technologies, I'm wondering if there's just as much chance of being offline from a GPS perspective as from an Internet perspective. I.e. if the signal drops, is GPS going to drop too?
Does anybody have any experience with this? The sat-nav in my car has never had issues tracking my location and I don't recall sat-nav on Android struggling either, so long as the maps are pre-fetched and a route doesn't need recalculating mid-journey, but of course I've never driven through a dense woodland!