Between the comprehensive in-game map, the GPS-imbued minimap, and the TomTom-esque functionality of certain vehicles, we've yet to misplace ourselves within Liberty City's digital boroughs. Still, if you find yourself lost whilst playing Grand Theft Auto IV, we guess this Liberty City map application (mapplication?) using the Google Maps interface would come in handy.
A number of user contributions have already been made to the map, showing the location of hidden items, easter eggs, pigeon locations, stunt jumps, and yes, even hookers, whom we assume were fitted with GPS locaters by trained prostitute handlers before being released back into the wild. It makes for a useful cartographical companion for those with a laptop near their console of choice -- if you don't mind ruining the fun of exploring the nooks and crannies of Rockstar's intricately crafted metropolis for yourself, that is.