Here is my Neptune 2 story: I was on a 4 way jump last Summer. We were doing pretty well, scoring a lot of points. I looked at my wrist to check altitude and my altimeter was gone! Popped right out of the plastic case. Grrrr... Back on the ground one of the guys on the dive said he went for a grip on that arm and saw it pop right out. Other guy on dive said it popped out at about 9 or 10,000 feet. They all are telling me there is NO WAY I will ever find it. Who knows where it is, give it up, it is gone... Much larger things have been dropped and never seen again. I borrowed another altimeter for the day, went home and just as I was about to go to sleep got a message that someone from a nearby town had brought it to the dropzone. They had found it on the edge of a park and knew it was skydiving related. Wow!! It has a big dent in it but besides that works just fine!! I now use the Neptune in my helmet as an audible and have a Viso on my wrist with a much sturdier case so that doesn't happen again!!