di-GPS Eco ProFessional M (with Locking Nut)

Turns any iPod touch, iPhone, iPad or PC (Mac/Windows/Linux) into a state-of-the-art GPS receiver. High quality product, designed and assembled in the USA!
“Made for iPod” certified by Apple. No need to “jailbreak” your iOS device. Comes with the free UltiMate GPS App, available on the App Store (requires iOS 3.0 or higher), giving you full control of your receiver. Works with most, if not all, location-based iOS apps available on the App Store. Also works with your PC (Mac/Windows/Linux), delivering standard GPS NMEA sentences over USB to your PC for use in navigation or location-based PC software (not included).
Use it in your car, on your bike, on your boat or in a plane. Use it for geocaching, hiking, golfing, cycling, running, or any other outdoor activity you can think of. Works great with apps like Navigon, TomTom, RunKeeper, Geocaching, Fore Flight, ESRI ArcPad, and many, many more.

Clear distance and direction to the closest geocache along with information like size, terrain, difficulty, and GC code
High-sensitivity GPS performance with core GPS functions like current position, height, and heading
A “found” list allows you to mark geocaches as found and review them later

SD adapter included
Includes topographic coverage of the entire United States, including Alaska, Hawaii and Puerto Rico
Provides detailed digital topographic maps

Store and locate up to 3 locations, provides distance and direction back
High sensitivity SiRF star III GPS receiver, Self calibrating digital compass
Weather resistant, Operates on 2AAA batteries (not included)