NPGPX is a Netscape plugin that can display routes, tracks, and waypoints from a GPX file. GPX (GPS eXchange) is an interchange format for GPS data. You can publish your GPS data online, and other people can use this plugin to view the data. It supports zooming and panning. The plugin is written primarily for Firefox on GNU/Linux, but it should work with other browsers that support Netscape plugins. It may or may not work on other operating systems.