As you are probably already aware, "tablets are taking over the world".
If you are shopping for an Apple iOS tablet, your choices are relatively limited as the number of models in Apple's line up is fairly small (keeps it simple!)
Android tablets and phones, on the other hand, seem to be everywhere, in many shapes, sizes, and features.
Many are tablets from well known companies, others are generic devices from unknown brands.
Often the name brand devices have additional features and better specs than their cheaper generic cousins.
You will often find that generic devices have slightly older versions of the Android operating system on them, and they are either updated very infrequently, or do not get updated at all.
If you have seen or are interested in a particular tablet, it is wise to search for online product reviews etc. to assist you in making your choice.
Also, while almost all Android tablets have GPS capabilities, there are many variations in the SENSORS which the tablets have on board.
Sensors are things like:
- Barometric pressure sensors
- Temperature sensors
- Proximity sensors
- Magnetic Field sensors
- Light sensors
If you intend to use a tablet for mapping / navigation duties, it might be wise to check and ensure that the model you want has a GPS and compass sensor at the least.
Some generic brands of tablets do not perform as well as other devices - beware!
Google is your friend!
The point is that it is worth spending some time researching before you make your purchase.