Which "APP" for measuring distance?

[Sling]

I have a Vectronics Terraphin range finder which works great! I've ranged out to over 4600yds with it but was just wanting to see if there is an app for IPhones that measures distance by using GPS as backup? I've read that Planimeter app works good, just wanted to ask around and see which one everyone is using. Thanks

 

[deadwooddick]

2¢

The "civilian" version of GPS isn't as accurate/precise as the "military" one. FWIW, kinda' doubt either (w/ 4 data points) will match laser rangefinder accuracy (w/ only one).