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Doc. P/N: WSP-009-004
Version: V1.3
Issue Date: August 2013
www.wassp.com
Page 23 of 62
Operator Manual
4.8.4 Sound Speed Tab
Sound speed varies with temperature and salinity, so this changes throughout the year. Use a
temperature sensor to set the sound speed if possible. Otherwise, the operator should become
familiar with this process themselves and adjust on a regular basis (at least monthly) as
necessary.
The Sound Speed 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 modied directly or computed from the temperature and salinity
values.
Refer to the section “10.2.4 Sea Trial - Commissioning Step 11 : Sound Speed” on page 51 of
the WMB-3250 Installation Manual for full instructions.
Seaoor Prole
Seaoor Prole:
Convex
INCREASE
sound speed value
Seaoor Prole
Seaoor Prole:
Concave
DECREASE
sound speed value
Sound Speed Guide:
1500 m/s for sea water.
1435 m/s for fresh water.
Salinity values:
30-37(35) for sea water.
0-1(1) for fresh water
NMEA Temperature:
If the Surface Temperature
data window does not
display a valid temperature
value, check that the
incoming NMEA data
contains the “MTW”
sentence.
Figure 17. Sound Speed Effect and Required Corrections
Figure 18. Ship Setup Options – Sound Speed tab
23


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