Data Sources and Type

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Raw EM1002 data telegrams were acquired over a shipboard Ethernet network. The data stream is shown in Table 1. In addition, a number of ancillary data sources were also acquired by C&C Technologies (Table 2).

Table 1. Kongsberg Simrad EM1002 data stream.

• entered static sonar alignment parameters.

• applied sound velocity profiles.

• external navigation data (1-Hz DGPS)

• ship-relative bathymetric profile data.

• beam-relative backscatter intensity data

Table 2. Ancillary data sources

• transducer temperature, conductivity and (derived) sound speed data.

• POS/MV 1-Hz position and attitude data (over Ethernet).

• independent serial record of DGPS data stream (GPGGA format).

• digital 21-Hz attitude from TSS-335B.

• original SeaBird SVP data