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I'm rather unclear about your requirement. You already have TomTom6, should you not just purchase the relevant maps of where you plan to visit. The map of Europe as an example but with particular attention for details of countries of interest. You may struggle a bit for maps of African countries as the coverage is not extensive or none existent.
TT6 has a facility to demonstrate your whole route before you set off. If on the other hand, you wish to track your movement while in the air, then a google search could throw up a thing or two.
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Only limited by not trying
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