mang ponso, you can get a GPS signal anywhere in the world - except in sensitive areas where the US DoD blacked-out the data, or where there's an obstruction like when you're inside a building or a cave, or when your GPS receiver's not sensitive enough. For GPS navigation, you'll need a GPS receiver, navigation software and finally, the right map.

A fellow tsikoteer offered his Philippine map for free, for the Garmin Nuvi ... read Carlos H. Lopez's posts: http://tsikot.yehey.com/forums/showt...ghlight=garmin. But you have to have a Garmin unit which as Camgen6 pointed out, is expensive. I haven't tried it yet, but I want to.

If you have a PocketPC, you can use a Bluetooth GPS receiver with it. I just saw a Holux GPS receiver at ebay.ph for only P3.5k. Unfortunately, the only Philippine map for PDA's that I know of is made by MapKing Asia - which only covers Metro-Manila.

BTW, satnav manufacturers have switched map providers from time to time, e.g. Tomtom had used TeleAtlas maps before but switched to Navteq maps on their Tomtom Rider and Tomtom One (2nd Ed), and then back to TeleAtlas maps again.

Garmin's are durable and have a reputation for better routing algorithms, but not that really far off from the rest. Tomtom's forte is its excellent user-interface. The Rider GPS is for motorbikes, just to give you an idea how easy it is. My Navman portable has Navteq maps, but I tend to use Tomtom more often. I have Tomtom installed on my PDA ... one less thing to carry around.