For me the best navigation app is Ndrive.

Works like a charm with HD2.

hi,i know everything about igo 8 if you need something.... i think that igo is the best

You could put Google Maps on your HD2 which is free for navigation.
Maps get downloaded as you go so are always up to date.

iran maps don't has for Tom Tom or igo

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hi guys
Tom Tom and igo very good software navigation but all world map don't has for example Iran map i can't find for igo and Tom Tom .
and this is very bad

i normally uses google map and sygic from time to time, but sygic always expires and want user to buy it, so i just stick with google maps.