Ship Setup Tab; General; Offsets; Sound Speed - Wassp WMB-3230 Operator's Manual

7.2

Ship Setup Tab

7.2.1 General

General settings provide:
Vessel Information: Vessel's name, country and home port may optionally be entered here. This
►
will be recorded inside any raw data recordings.
WASSP Hardware Settings: The Transducer Serial Number and BTxR Serial Number are filled in at
►
time of installation. These should not be changed by an operator. The BTxR Versions are reported
from the BTxR for diagnostic purposes.
Device Settings: The three sensor types required for accurate profiling can be selected from
►
drop down lists. Select the appropriate installed sensor for each of the sensor types. The
advantages of having correctly selected sensors are that you can compensate for pitch (and
possibly heave) as well. To make corrections using the SC30's Pitch, Roll and Heave values, select
the appropriate check boxes.

7.2.2 Offsets

Offsets are configured during the installation and commissioning of the WASSP system. See "8.1.1
Commissioning Step 1: Ship Measurements" on page 37 of the Installation Manual for more
information.
Transducer Heave Compensation: This check box should be selected if the X, Y, and Z offsets
►
have been recorded AND a motion sensor is configured. This settings enables the system to
compensate for relative heave at different points on the vessel generated by the vessel pitching
and rolling.

7.2.3 Sound Speed

The Sound Speed sub-tab allows you to set surface speed correction settings for fresh and sea water.
Valid values for both sea and fresh water range between 1000 and 2000 m/s.
Knowing the temperature gives a close approximation for the sound speed. In Manual mode the
Surface Sound Speed can be modified directly or calculated from temperature given a Salinity value.
Seafloor Profile
s
alinity
The default value for the salinity of sea water is 35. This value should not be changed unless the
actual salinity of the surrounding water is known. If fishing in fresh water, the value should be set to 1.
Clicking on the Calculate button will re-calculate the Surface Sound Speed value based on the Salinity
and Surface Temperature values.
nmea t
emperature
If Use NMEA Temp is selected, the WASSP software will use NMEA temperature data from an external
temperature sensor. This information is shown adjacent to this option and will be reported in the
"Surface Temperature" window with any "Temperature offset" added to correct for any error in the
external temperature sensor.
48
Convex profile
INCREASE
sound speed value
Figure 28. Sound Speed correction
www.wassp.com
Concave profile
DECREASE
sound speed value
Seafloor Profile
Doc. P/N:
Version:
Issue Date:
WSP-009-008
V1.3
April 2014