iMessage isn't just for texting, you can easily and instantly share your location with friends, family, and colleagues as well. Whether you're lost or need someone to give you directions, or you're waiting and want to help someone find you, iMessage is as simple as hitting the share button and sending.
That's all there is to it. They'll receive your location in a message that will automatically launch them into the Maps app on their iPhone or iPad.
If you're having issues getting iMessage to activate, get more help at the iMore forums, and for more tips, check out: