In reply to mypyrex:
A few points to consider:
1. Not all models of tablet have GPS sensors in them. Best to confirm this before you buy (and even if the tablet does have a GPS sensor, it won't be as good as a smartphone or dedicated GPS for navigation).
2. Tablets haven't really *replaced* laptops yet, but they're well on the way towards doing so. Certain tasks are always going to be better on a windowed operating system allowing true multitasking. Tablets are best thought of as lightweight computers, not full computers.
3. That being said, most people will be able to use a tablet for light productivity (word processing, spreadsheet etc) with the correct software and a bluetooth keyboard. The "tablets are for content consumption only" cliche is several years out of date. I have written entire books mainly on tablets.
4. iPads are the easiest tablets to use, are of very high build quality, and have the widest variety of apps, but they're expensive and have some limitations (eg. no open file system).
5. Operating system is less important than it used to be, but if you already have an Android phone then an Android tablet might make things easier for you. Avoid anything that costs less than about £150 as these devices tend to be rubbish. Something like a Nexus 7 is a good starting point and is pretty easy to use.