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I have a small 1.5" or 2" spg as a backup to my wireless computer. Have never needed it, and periodically think of taking it off, but if the transmitter battery dies or my computer crashes or something weird happens, I can continue my dive (I also carry a backup computer).
Without a backup spg, it would really be no big deal...I would just have to end the dive, but I suppose if I was on the first dive of a 2-tank boat dive and my computer or the transmitter failed, it could be irritating.
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