All ranges and SPLs are nominal.

*SPL is measured in dB/1 miPA at the dive site. To convert SPL for sound levels referenced to mbar, subtract 100 dB from tabled levels.

Table 1A-5. Helmeted.

Permissible Exposure Limit (PEL) within a 24-hour period for exposure to AN/SQS-23, -26, -53, -56, AN/BSY-1, -2, and AN/BQQ-5 sonar, including versions and upgrades. Exposure conditions shown above the double line should be avoided except in cases of compelling operational necessity.

Estimated Ranges in yards for given SPL and PEL for sonar.

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