Option

Description

Input source

1. Select input

• Selection is displayed by default if any track lines are selected. You can change this to “All track Lines”

• If no data is selected SVC will be applied to all track lines.

For Kongsberg data, select All Track Lines

General

Sound Velocity Profile File

SVC will use either the sound velocity profile from your converted data, or the last SVP file applied to the data. If SVC has been previously applied, the name of the SVP file used will be displayed in the SVP File field.

To select an SVP file:

1. Click the check box to enable the Browse button.

2. Navigate to and select the profile file to apply.

Profile Selection Method

1. Select a method from the drop-down list:

• Previous in time - Apply the SV profile with a time stamp just prior to and nearest to the time of the recording of the survey data.

• Nearest in time - Apply the SV profile that was taken closest in time to the recording of the survey data.

• Nearest in distance - Apply the SV profile that was taken closest to the position where the survey data was recorded. This requires that positions be included in the SVP file.

• Nearest distance within time - Apply the SV profile with a position that is nearest to the swath and has a time stamp that is nearest to the time of the swath, within a selected range.

• Last used method - Apply the last selected profile method to the current SVC.

If a line has not had SVC applied previously, attempting to use the Last used method option for correction will cause the process to fail. In this case, choose another SVC method.

Nearest in Distance Hours

If the Profile Selection Method is set to Nearest in distance within time, the Nearest in Distance Hours field is enabled.

1. Type the number of hours to use with the nearest in distance within time profile selection method.

Options

Heave source

1. Set the type of heave to be applied during merge.

Realtime: original heave data will be used.

Delayed: delayed heave data will be used

If you choose this option, and no delayed heave data is available, there will be a warning message in the Output window, and regular heave data will be used instead.

Delta Draft / Subsea Depth (vehicle depth)

By default, Dynamic Draft (if available) is always applied if the option is set in the HIPS Vessel file.

If the Delta Draft option check box is selected, Delta Draft (if available) is applied in addition to Dynamic Draft rather than being applied instead.

1. Select the Delta Draft / Subsea Draft check box to apply available Delta draft data.

Use Surface Sound Speed

This option is set by default. If it is turned off:

• SSP is not used in the SVC process even if it is available.

• the Steered Beam Angle Recomputation option is not available.

This option is not available when using the Sound Velocity command (Kongsberg) with Kongsberg data, since SSP data will be automatically applied (if available) when the Sound Velocity Correction (Kongsberg) command is used.

See Reference - Surface Sound Speed for more information.

Steered Beam Angle Recomputation

1. Select the Steered Beam Angle Recomputation check box to re-compute the steered beam angles based on a new surface sound speed that is interpolated from the sound velocity profile.

See Steered Beam Angle for more information.

This option is disabled if “Use Surface Sound Speed” is enabled.

Smooth Sensor

1. Select which smoothed sensor data is to be applied during sound velocity correction: Heave, Pitch, Roll, Delta Draft.

Sensor data can be smoothed in the Attitude Editor.