Clamp works great on my Garmin 64sx. Easily slides into the back of the device and snaps into place. Some have complained that it's difficult to remove. I do not think so. Simply lift the bottom of the clip slightly and then pull down. The carabiner looks pretty solid. I use it to attach to my belt loop while walking. Haven't used it on my backpack yet but don't see a problem. While it also has a plastic clip that you can use, I found they break fairly easily. The only thing I complain about is the price. This should be about half the price for what you're getting. A GPS would be even better. Garmin is not that customer friendly
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