Hi GPSmad,
In your case, with all the places you want coverage, availability of maps will be more of an issue than nav features.
I would take a look at Garmin's web site. Look under "
MAPS >> On The Road" and see if you can find maps that give you coverage for the parts of the world you need.
If Garmin has the maps, they also have a possible nav program solution. They make a program called Mobile PC. It has the usual nav freatures but it's not necessary to use them and it's way easy to use in the way you want.
In order to be able to add maps to it you will need to buy one of the bundles where it comes with a Garmin GPS receiver. One version comes with a GPS10x Bluetooth receiver; the other comes with a GPS20x USB receiver. Both are good receivers.
If this solution interests you, you can take a look at the
Garmin Mobile PC section on here for tips on loading maps and other stuff.
I won't pretend that this is a perfect solution. It will have its challenges. But with the number of areas of the world you need coverage for it might be the only one that comes close to giving you all of the map coverage you need.
...ken...