This file is edited from the Navy SONAR recorded yesterday by John Boyd through the Whale Museum Lime Kiln hydrophone. The sonar had a fundamental frequency of 3.8Khz with harmonics up to 15Khz. The fundamental frequencies of killer whale calls range from 300Hz to 6 kHz. Killer whales respond to tones within the frequency range of about 0.5 to 125 kHz. Peak hearing sensitivity for killer whales is about 20 kHz and their sensitivity declines gradually above and below 20 kHz. Dr. Val Veirs of Beam Reach reported that the SONAR source level was in the range 175 dB to 225 dB re 1 microPa@1m.