Summary: Could not figure out how to get this product to work. I tried garmin.com's site, I tried the iPhone app. Ended up waiting my money and time for something that either does not work or is too hard to get working. Oh well. Neat idea. Fail.
Summary: I am just getting into Geocaching and stumbled on the "Chirp" via Garmin's web site and my Montana 650T device. When I set the Chirp up and went to my first cache, it made a "chirp" sound on my GPS a half mile prior to the cache site to alert me I was getting close. I found the cache and logged my entry. Between the GPS and the chirp you can be a more successful Geocacher.
Summary: The chirp works as advertised, except that under typical conditions its range is shorter that specified. The "chirp" sound would be more effective, if the Garmin GPS devices had a louder audio alert beep.
Summary: This little unit met and surpassed my expectations. It works as advertised. I'm using it in a multi stage geocache setup. As people get close to the beacon, it transmits the location data and hint or note to a respective GPSr unit. Great fun! I would highly recommend this unit to other geocachers who are interested in placing a unique and interesting fun geocache.
Summary: Garmin could have sold a b'zillion of these had they NOT made them proprietary to only a few Garmin GPS devices. IPhone and Android compatible Chirps would have made Garmin the most visible brand name in GPS devices. Instead they chose to use it to try and sell more Garmin GPS receivers. Why, when my Android gps app with superior and free updatable Google maps works fine?
Summary: I purchased and then immediately returned it by the grace of Amazon because I guess that it's not normally accepted as a return - SO CHECK THE RETURN POLICY BEFORE YOU PURCHASE BECAUSE AMAZON MADE AN EXCEPTION FOR ME and accepted my return but they said that it's not usually accepted once you purchase it. I purchased the product because, stupid me, I expected it to work with my Nuvi GPS system, which it does not do.
Summary: We are finding these add a new and exciting element to the world of geocaching and intend to buy several more. So far, we are very pleased and are really having a lot of fun figuring out how we can add them to more and more geocaches.