Depends what you are using as hardware and how much effort you want to put in.
There are plenty of maps available - Russian military maps for all of W.A. are freely available as are IGN 1: 200k (for Mauri and Senegal at least).
Links to where you can get these are on other posts on this site (sorry, can't find the links at the moment) and iirc are calibrated for Ozi Explorer.
A pda (I'm using a Mio p550) running OziEx will give you "you are here" sat nav. How accurate it is is a different matter but for the areas I've used it in its been between spot on and a mile or two out (depending on how accurate the original mapping was I suppose)
The same pda also runs TomTom Euro satnav with a change of sd card. Ok it's not as neat as a Rider2 or a Zumo but it is one box fits all in my car and on the bike.
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