Download the android app and log in. Then send your friends a link with a map showing your live location.
Your location updates every second for all the world to see.
It's free, but you can donate if you want to help with server expenses.
Tracman uses an android app to recieve GPS location of your device. Sorry, there's no iPhone version yet.
If you need to go undercover, just turn tracman off with the flip of a switch.
Change your settings to show a less accurate location, if you want an air of mystery.
If nobody's tracking you, tracman won't needlessly drain your battery.
You'll get a simple webpage with a map to send to friends. It'll look like this.
Just send a link to whomever you want. Bam, now they know where you are.
Map updates in realtime with websockets.
Change the map default type and zoom level. You can also show speed and altitude.
There are a lot of reasons why publishing your location online could be a bad idea. I assume no responsibility whatsoever.