Summary: It was easy to install and works great with my Garmin GPSmap 62s. I get both cadence, which is great for training for road biking and I leg distances. The only thing that bothered me was the stay ties. The ones I got were too small for the circumferences.
Adding additional maps and using a microSD card are frustrating
T. S. Schulze, Amazon
21 September 2014
Summary: The Garmin Etrex 30 has been very useful to me in my charting of World War One and World War Two battlefields. I can't give it four or five stars, though, because I find Garmin's system for downloading and loading additional map materials too onerous.