The Pre app gets your GPS coordinates and posts the information to your webserver via a PHP page that stores the data in a local file. Then, give the index.html link to your friends so that they can look at that address to see your position
Download the Web files for the PHP server from here:
http://d0lph1nk1ng.is-a-geek.com/pre...tude-0.1.0.zip
Download the app from the Homebrew Apps Gallery: Longitude
After downloading the IPK and ZIP file, extract the ZIP files to your PHP server directory. Also, you will need to generate a Google Maps API key. Then go into the index.html and change the name to your server or IP address and enter your API key. Then, in the IPK, put the server address or ip in the preferences screen.
i take no credit for this app and the original thread can be found here:
http://forums.precentral.net/homebrew-apps/197203-longitude-google-latitude-substitute.html