Japan Radio Co. JFE-380, Инструкция по эксплуатации

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The echo of a seabed with abrupt slope is recorded as a lone difficult to see and less
discriminative, since it tends to accompany with a false echo due to the sidelobe and the
inherent property of directivity.
In particular, a seabed with abrupt slope and heavily rugged surface provided an echo very
difficult to display on the recording.
Appendix 46