MyPosition is a iphone application that show you your current position on google maps and allow to send it by email.

There are several levels of accuracy:
– POOR (Accuracy > 300 meters)
– FAIR (Accuracy < 300 meters) - MODERATE (Accuracy < 200 meters) - GOOD (Accuracy < 100 meters) - EXCELLENT (Accuracy < 50 meters with GPS) - IDEAL (Accuracy < 40 meters with GPS) To be able to send your position you need to have at least the GOOD level.

http://appshopper.com/navigation/find-my-position