How do you avoid scaring people who happen to see you out in the water alone? There's the "I'm OK" signal, but thats only understood by scuba divers.
Let me give you the example that happened to me today: I entered at my campsite and dove across a shallow bay, which is about half a mile wide. I dove about 3/4 to the other side, following an underwater structure, then turned around, and got to about maybe 500 yards from shore and was getting low on air, so launched my SMB so I wouldn't get hit by boats, and ascended. I could wade part of the way back and surface swim part of the way back.
Anyway, after a long surface swim back, I realized that people at the campsite were watching me and very worried. I felt awful. I had a feeling that might happen... so at one point I stood up in a shallow area in case people were watching, but I couldn't really see. ANyway, I feel terrible, and wonder how this could be avoided? Any ideas?