Sorry, I was working on an assumption that you're still in the market for a 2-DIN AVT HU. But since you already have one, these are your choices in order of expense:
1. Get a portable GPS such as a Nuvi. Depending on model, you can get one for as little as P8k for the entry-level ones. Don't buy them at the malls since they charge 2-3x as much. Better if you have someone coming in from abroad to have it hand-carried to you.
2. Get the AVT module that would work with your current HU (assuming it's GPS-ready). Besides this being more expensive than #1, I personally dislike the map and GUI of AVT GPS units. I'm sure they'll get better over time, but if you're talking about NOW, I would get a Garmin.
3. If you're really into consolidating GPS and HU functionality and you have the budget, replace your 2-DIN AVT with a 'proper' 2-DIN HU. So far, I only know of Kenwood having their GPS/Nav units OEMed by Garmin. The Garmin module I mentioned (KNA-G431) will probably cost anywhere between P14-17k if you buy it from the US. The same model being sold locally are too expensive, usually starting at P25-30k.
Referring to my sig below, the Kenwood DDX8034BT cost me about P50k when I bought it late last year. It included a couple of freebies (iPod integration cable and TV Tuner module)... as a sort of Christmas gift to myself. I am sooo happy with this setup. Particularly, it has 2 USB ports (1 for the iPod and another for an external flash memory or hard disk). I use an iPod Classic 120GB for my music and videos and a 320GB hard disk for movies and TV series (both stowed inside the glove box). With two dedicated USB ports, there's no more shuffling between the iPod and the hard disk. The sound is equally stunning primarily due to the 13 Band Graphic EQ, Digital X’over and Digital Time Alignment. You might want to Google it up for the other features.
I took the following video the day I had it installed. I didn't have the 320GB HDD back then and was just using a MediaGate external hard disk media player. Just look for it in my YT channel (DDX-8034BT.wmv): http://www.youtube.com/oj88
For steering remotes, you need some sort of box (ie. XCarlink) to interface the OEM remote to the HU.
Good hunting!





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