Also check OsmAnd, seems to be one of the default app choices for OSM maps and is open source.

The free version allows you to download up to 10 regions, and it's quite user friendly.

Where I am now, the offline OSM vector map is a lot more accurate than Google maps, the only better map I have found is a country specific collaborative Garmin-compatible map.


I reckon the tablet could work fine in a 4-wheeler, I still prefer a GPS like the Garmin Montana (or the new Android one that uses the Montana hardware) for durability and ability to be used on the bike, hiking, and boating.

Another question: why a tablet? There are relatively cheap and powerful Android phones available with screens from 4.3" to 6.5" which are possibly more robust and flexible. There are probably more mounting options for the more standard sizes.
It could also provide a backup to your dedicated phone, assuming you take one. Most of the better Android chinaphones allow for 2 or more sim cards to be installed, quite useful if you are traveling in are where coverage varies by network, or where you may want one card with a data plan, and another with a call/SMS option.
You can also get apps that will allow the phone to serve as the GPS to a Bluetooth laptop or tablet.

Having said that, some of the phones I've tried have poor GPS reception, taking a long time to get a satellite lock, and also battling in mountains, forests and built up urban areas.

In that case I often use a bluetooth GPS tracker dongle/mouse instead of the onboard GPS. It seems as powerful as the dedicated GPS systems, and gets 25 to 40 hours on a charge.
It also works with my Android tablets (2.3 and 4.0) and my Windows laptop.

Another advantage with the bluetooth tracker is that it is small and easier to mount where it can pick up a good signal, letting you position the phone / tablet for optimal viewing and safety. It also helps keep the phone / tablet out of the sun, high temperature is a killer for many devices and batteries.

The tracker I am using is an older Qstarz BT1000Q , and I use Bluetooth GPS Tracker from Argotronic (IIRC) to connect it to my Android phone and tablet. That app seems the most reliable of the 3 or 4 I have tried.

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