I have had my 2 transmitters connected to first stages for a few years.
I recently took up cave diving where, as you all know, redundancy is key. I felt adding a couple spgs would provide a little extra peace of mind.
I have never had a transmitter signal issue but these issues aren't exactly planned either. In the event that a transmitter ever does fail, it would be comforting for me (and for my buddy) to know what WE have left in the tank as we exit the dive.
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...thanks to lockdowns I am currently at 23 days since getting wet and it's driving me nuts.