Beam Reach

More hydrophone calibrations

Monday, September 24, 2007

After Anne’s freshly baked bread for breakfast, we completed our chores and sat down to voyage planning. We discussed goals for the day, as well as goals for the week. We lifted anchor and motored out of Snug Harbor for a quick lunch and then set up our hydrophone calibration. The speaker was dropped off the starboard side of the Gato Verde, while 7 hydrophones strung together were lowered off the port side. We played S1 calls, cal tones, and tones to try to calibrate our hydrophone array, high frequency hydrophone, and Marla Holt’s high frequency hydrophone. After disassembling all of the gear, Todd spotted two cargo ships on the horizon and Tim wanted to try to record vessel noise with the high frequency hydrophone. Shannon took photos, Anne held the hydrophone, Alex found distance with the range finder, and Sam helped with recording data. We rolled out the jib and sailed north for a little, waiting for the ferry at 1630. As the ferry approached, Tim used the high frequency hydrophone again to record vessel noise. After the ferry passed, we headed to Reid Harbor on Stuart Island for the night. We tied up to the dock, and Alex made eggplant parmesan with linguine for dinner. Shannon was aching for a stroll—so, she, Val, and Ashleigh attempted to check their voice messages at the top of the hill, but only Val was successful. Then Shannon updated this blog and Ashleigh and Marla discussed Marla’s thesis research. Anne baked a second loaf of bread. Alex caught up on her Vanity Fair reading. Sam tried unsuccessfully to get online. And Tim worked with Val on creating a calibration curve for the high frequency hydrophone.