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sboardcrazy said:
Be careful having it in the side pocket.
I've busted my ribs many times hitting the boom or kit. I don't stack very often but do a good job when I do..

I soon worked out that the impact vest sides needed extra padding..the early ones weren't very good, but they must have taken feedback on board, because the later ones are more padded. I have the Forward impact vest.
The Neil Pride buoyancy vest I had gave no side protection..Maybe later ones have improved.
You don't want it anywhere it can be an impact hazard in a stack..
Wow, I'm in awe of you, Sue! So few girls get out and sail, and even fewer would persist after stacking hard enough to break bones!

I find my custom pocket attached to the inside of my vest in front of the shoulder seems to be a good solution to keeping the PLB out of the way yet accessible and protected from dings. outside the vest should also work just as well, in the same location.
Have fun out there!