RE the post about iphone, i use it also and have i4, a good app for distances is golfgps. i believe it's free and made with golf in mind it's really good for any distance finder. gps marks your spot and you move the cursor to determine length to an object and best i can tell is indefinite. it also has rings from your location that can be set to determine yardage or taken off. it shows 5 rings at 10 yards the outer ring is 50 for example. i've used it to determine how far islands are, opposite coasts other boats, anything. another good tool is commander lite, a compass with a gyro meter. i admit it's complicated to me but has map location, gps, mph, you can mark your parking and locate vehicle...if needed. the gyro is really neat though and shows celestial bodies. makes you dizzy looking at it though.
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