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I bought this mount to use on my personal watercraft. It does work but I feel that it's a bit too flimsy and feels like it will break easily. I have the Garmin handlebar mount on my motorcycle and it's much more sturdy.
I have used this marine mount on my PWC and it hasn't broken "yet", but I don't have much confidence in it. I will use it until it breaks then replace it with a RAM mount.
I removed the middle adjustment section to make it more compact and less flexible. It is nice that Garmin designed it such that you can remove the extra section and still have it work.
I have an Astro 220 which is of the 60 series mold. Snaps in place and is very stable. Perfect for a boat. Can easily change angle of unit for viewing. Small footprint with black circle plastic base. Base is screwed into boat. Put mine on the left side of the center console. Rest of mount can be easily removed with a plastic head screw. Just make sure you put the base where you want it the first time and naturally use stainless screws if on the salt.
garmin marine mount are so cheap. garmin marine mount available on amazon with a great price ever. My only complaint is that it is designed specifically for a Garmin Model 60 GPS. I have a 62s, a similar unit but Garmin changed the rear cover design from the back screw used on the 60, so it's not possible to attach the 62s without elastic bands or other questionable means.