I have not used Fugawi. That is perhaps an oversight on my part. Fugawi has always struck me as very much a "roll your own" product whereas I come to laptop navigation from personal navigation devices where you just turn it on and go. At most you buy some different maps from your vendor (Garmin in my case) and load them up as needed.
I did look at Fugawi a few years ago but I was looking at it for a very different reason. Now that winter is here and golf season is over I guess I should take a look at Fugawi and see how it has progressed.
I can say that the software-only version of Mobile PC will do what you want as long as you can stay clear of Garmin's locked map products (aside from the maps that come with it, of course). If you just plug something like "garmin compatible maps" into your favorite search engine you should get lots of hits. That will allow you to decide whether you can get the coverage you need.
I know you won't get the entire world but there is a tremendous amount of work being done at
www.openstreetmap.org and similar sites. Openstreetmap has the goal of doing a complete world map. There are related sites for work focused on specific regions, whose work is directly linked into the overall effort.
Other independent sites have smaller goals to do regions, like
www.malsingmaps.com for Malaysia/Singapore and other parts of SE Asia.
There is a mix of free and commercial products out there that are Garmn-compatible.
With either Fugawi or Garmin I think you will still have to do a fair bit of your own work to assemble all the maps you require for anything approaching world coverage. It's too bad Garmin makes it such a pain to use their software-only Mobile PC product with their non-bundled map products for more than just regional coverage.
...ken...