According to the Google MapMaker site, "Google Map Maker has many of the same features and functionality of Google Maps." According to Google Maps, "anyone with an Internet connection and a supported web browser can use this free service on a desktop or laptop computer." The supported Web browsers are: IE 6.0+, Firefox 2.0+ and Safari 3.1+, so I guess it depends on whether you can access any of these browsers with your GPS. According to the Google MapMaker site, the Philippines is one of the countries currently being mapped.
Source(s):
http://googlesystem.blogspot.com/2008/06/google-map-maker.html
http://sites.google.com/site/mapmakeruserhelp/
http://sites.google.com/site/mapmakeruserhelp/introduction
http://maps.google.com/support/bin/answer.py?answer=68259
http://maps.google.com/support/bin/answer.py?answer=16532&topic=10792
http://sites.google.com/site/mapmakeruserhelp/collaboration

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On a side note, there is a project to develop turn based maps for Garmins.

http://roadguide.ph/

It may be easier to buy a Garmin and then upload this map.  I'd at least look into the information.
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