Its been a while since the 3.0 software for the iPhone has been released and with it the promise of allowing 3rd party developers to make turn by turn navigation a reality on the platform. Tom Tom has a solution for the US but its not available for the Thailand App store. Those hoping to use Google Maps may be a bit disappointed as most of the country is covered by EDGE or GPRS which does not allow you to stream map updates in a timely manner. Don't even think about driving with it even on 3G here, its just not good enough yet. 

  Before finally giving in to getting a stand alone Garmin, I stumbled across an app called Sygic SEA (South East Asia). Doing a bit more research, I found out that there are versions of this app for WinMo and Symbian as well as an Android version of this app called  HTC Magics which are sold in Singapore. Can something which is bundled with a handset be good? I had to find out. But ouch, $79.99 for an app, whoa! But wait, no worries, this seems to be standard with stand alone GPS units as well as the Tom Tom app in the app store. A definite plus is that this app costs about US$20 less than a comparable Tom Tom app for the same region.  A purchase and a few minutes loading time later, I had the $79.99 app on my iPhone. I know what you're thinking, for that amount of money, you can get a stand alone GPS unit, though it may be an older unit. But for the sake of not having to carry around another device and its charger and cables, I think this is a rather good compromise. 

   Loading up the app for the first time, you're taken through an initial setup process. First you select a language, then a voice prompt. I was pleasantly surprised to see that they had Thai voice prompts as well, but I chose US English. Next is the units you prefer for measuring distance. Once that is done, you are taken to a quick guide screen.

Source: Cnet Asia