You do both.
A GPS because there are very good for navigation.
A paper map because they are reliable, most people (well some people) can be consulted about them for where (are we, to go, is the best road to etc).
Which map/gps is another question. That answer will change depending on who you ask and where you are asking for.
For GPS I'd use Garmin. Some would use Magellan (sp?). If you look up Open Street Maps (OSM) you'll find out why people like these - the OSM has been converted for the use of these GPSes so you can get free GPS maps for the world on them. These maps can be very good (where people contribute a lot of data) to very poor (where data is lacking). The places you want are reasonably well covered.
Paper maps ...
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Hold it .. you do realize some places are difficult to get permission to go to... or cross boarders with a vehicle? Burma for one. All well and good to find a line on a map.. but using that road may not be possible for mortals.
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