This service will update location info for your Flickr photos syncronizing GPS tracklog to your Flickr photos time taken. Service will use only track points, other information (waypoints etc.) is ignored. Currently it supports GPS Exchange format (.gpx) and GPS Trackmaker Text file (.txt) for input, in the future I might add other formats. GPX is supported by majority of GPS software, see the list.
This tool is useful for people who have a GPS unit in their car, boat, plane or backback and shoot photos as well. It is much quicker and gives better precision than using Flickr map interface.