Note 1: Path loss may be due to many effects such as free-space loss, refraction, reflection, aperture-medium coupling loss[?], and absorption.
Note 2: Path loss is usually expressed in dB. Synonym path attenuation.
Source: from Federal Standard 1037C and from MIL-STD-188
U-1231[?] - U-1232[?] -
U-1233[?] - U-1234[?] -
Displacement: surfaced 1120 tons, submerged 1232 tons, total 1545 ...
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