Sonar Attack!

Early this evening we started hearing a beeping onboard. We are pretty familiar with all the beeps that can happen on our boat--bilge alarms, fume alarms, watches, cell phones with low batteries, reminder alarms, errant air conditioners, etc. But this beeping really stumped us. We spent about 10 minutes trying to localize it... was it down below? In the bow? In the stern? In the engine room? It is REALLY hard to tell where it is coming from.

We were pretty convinced it wasn't onboard, but when we went outside to see who else's boat was beeping, it was not as loud as it was down below. Hmmm...

We finally came to the conclusion that it must be Sonar signals coming through the water. A chat with a neighbor on the dock confirmed that occasionally a ship in Pearl Harbor is testing their sonar. She said sometimes it lasts for 24 hrs or more. Ooooohh nooooooo!

I'm a light sleeper. It's nearly 11pm and still beeping loudly. I think it's going to be a long night!!

But... it seems to change tone every now and then... almost like it's moving around. Do we have a mini-sub playing in our harbor??
-----
Sherry & Dave
in Honolulu, Hawaii for the winter
At 11/5/2010 6:06 PM (utc) our position was 21°22.26'N 157°56.27'W