Another thing people overlook when ranking the "best" GPS is fact that maps differ from country to country.
Navigon in Australia uses map that is probably at least two years out-dated, and has no speed information. POI is really the most horrid I've come across.
Tom Tom Australia is probably the best choice in this country, just surpassing Sygic, but using it in Asia is not possible since there is no map for it. Sygic is the only candidate in South East Asia ATM.
Tele Atlas is not always the best map in every country. Similarly Navteq is not the best map in every country. In some countries, they partner with other smaller map providers, and the quality differ from country to country.
Navigon in Australia uses map that is probably at least two years out-dated, and has no speed information. POI is really the most horrid I've come across.
Tom Tom Australia is probably the best choice in this country, just surpassing Sygic, but using it in Asia is not possible since there is no map for it. Sygic is the only candidate in South East Asia ATM.
Tele Atlas is not always the best map in every country. Similarly Navteq is not the best map in every country. In some countries, they partner with other smaller map providers, and the quality differ from country to country.