This is a quick little app I whipped together when the game first came out for the PS2, and I thought I would share it with ya'll. If you click the left mouse button, it will bring up some extra options. The main purpose of this was to allow people to quickly explain exactly where something is within the game.
Unfortunately there wasn't much interest in it, so I stopped adding anything to it. If anyone is interested in gathering coordinates for different things, just send them my way and I'll add it to the list.
hxxp://ca.geocities.com/gtasanandreascoordfinder/
(change the 'hxxp' to 'http')
Cheers