8.3.1 Gyrocompass Calibration Methods ............................................................................ 109
8.4 The Motion Sensor .............................................................................................................. 114
8.5 Sound Velocity Probes ........................................................................................................ 115
8.5.1 CTD Probes ................................................................................................................. 116
8.5.2 Time of Flight Probe ................................................................................................... 117
8.5.3 XBT Probes .................................................................................................................. 117
8.6 The sound velocity cast ....................................................................................................... 118
8.6.1 Time of Day ................................................................................................................. 118
8.6.2 Fresh water influx ....................................................................................................... 118
8.6.3 Water Depth ............................................................................................................... 118
8.6.4 Distance ...................................................................................................................... 118
8.6.5 Deploying and recovering the Sound Velocity Probe ................................................. 118
9 APPENDIX III: Multibeam Surveying .................................................................................... 121
9.1 Introduction ........................................................................................................................ 121
9.2 Survey Design ..................................................................................................................... 121
9.2.1 Line Spacing ................................................................................................................ 121
9.2.2 Line Direction .............................................................................................................. 121
9.2.3 Line Run-in .................................................................................................................. 122
9.3 Record Keeping ................................................................................................................... 122
9.3.1 Vessel Record ............................................................................................................. 122
9.3.2 Daily Survey Log .......................................................................................................... 123
10 APPENDIX IV: Offset Measurements .................................................................................... 127
10.1 Lever Arm Measurement – Offsets ..................................................................................... 127
10.2 Vessel Reference System .................................................................................................... 127
10.3 Measuring Offsets .............................................................................................................. 128
10.3.1 Sonic 2024 Acoustic Centre ........................................................................................ 128
10.3.2 Horizontal Measurement ........................................................................................... 128
10.3.3 Vertical Measurement ................................................................................................ 129
11 APPENDIX V: The Patch Test ................................................................................................ 131
11.1 Introduction ........................................................................................................................ 131
11.2 Orientation of the Sonic 2024/2022 Sonar Head ............................................................... 131
Page 9 of 210
Version 5.0 Rev r002
Date 05-08-2014
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