I have the dongle directly bought me for receiving the signals of the "Garmin Chirp Geocaching station" in order to receive this also with my iPhone 4 can. So far I could only try one of these cache, but the reception was flawless with the appropriate app and worked right away. With the cheaper "normal" ant Dongle Garmin this feature is not supported. If one of the higher price of this Wahoo dongle is worth, then there is no alternative, zz. The Garmin GPS devices that support the chirp function are still significantly more expensive. For this application, so my recommendation.
