Ti kanei h pyksida ekei Georgie? Etsi to poulane H einai dikh sou parembash?
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Its a button compass, used in various applications.
I have a few, but this is the most accurate. It fits on the rubber hand band, and I "play" under water navigation

With the left hand, you hold the right one at the elbow, so the compass is infront of your eyes, and you follow the indication to swimm towards the "target".
Normally, this is done in 5-10-15-20 meters of depth, I do it on almost the surface, but with the head in the water. Until I hit the rocks
