Using your GPS you can take your position with an high precision
Know your Latitude and Longitude in WGS84 degrees format
For each position you can know which is the accuracy and the satellites used to take it

Save you location with a name and export them in:
✓ CSV (you can read it with MS Excel)
✓ KML (you can load it with Google Earth)

With every single saved location you can:
☆ View on map
☆ Share with a friend
☆ Set Google Map to navigate on it
☆ export via EMAIL
☆ save on your device