https://www.youtube.com/watch?v=PuP2YmxnOWI
Do it like in the video, don't push ring from the top, it may break.
You can take the safety pin away if you like. I guess the ring will more likely breaks when you put it on or off, not while running. I have used it mostly without the ring just with the safety pin. Inside O top, shoulder or back of the neck, safe places. I weal my globalsat that way too. But you can't take splist (but who takes them in races anyway?).
It's waterproof and everything, so you should simply not care, just swim if needed. If a branch takes it, well, that happens. Nothing lasts forever.
It almost always find satellites in ten seconds, but it''s based on sat data it gets via the usb cable. Often fine, but always better do it the old fashioned way to make sure we get the best possible track.