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Page 56 of 68
Installation Manual
Sea Trial - Commissioning Step 13 : Sound Speed
Sound speed varies with temperature 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 (at
least monthly) basis as necessary.
Sea-floor Profile:
Convex or flat
INCREASE
sound speed value
Sea-floor Profile
Option 1 : Manual Sound Speed Correction:
1)
Set the screen display (user interface) to Sonar view.
2)
Set the sound speed computation method to Manual in the Ship Setup
Sound Speed Tab.
3)
Find a section of sea-floor that is known to be flat, preferably 20-100m deep.
4)
Cross over the section of sea-floor and adjust the sound speed value in
the Ship Setup Sound Speed Tab until any curve in the sea-floor has been
removed.
Option 2 and 3: Surface Temperature Correction (NMEA or WASSP)
Newer WASSP Transducers (Transducer number 500+ or 850+) may be equipped
with a temperature sensors if this is the case a WASSP Temperature reading will
be shown on the Sound Speed Tab next to the Use WASSP Temperature when the
system is pinging, If NMEA MTW is being received this will be shown next to the
Use MTW option.
1)
Set the screen display (user interface) to Sonar view.
2)
Set the sound speed computation method to Use NMEA MTW or Use
WASSP Transducer.
3)
Fin a section of seafloor that is known to be flat, preferably 20-100m deep.
4)
Cross over the section of sea-floor and adjust the Temperature Offset until
the seafloor curve has been removed.
temperature.
The urethane also behaves differently with temperature and thus when
a temperature sensor is available the urethane correction will be applied
automatically. The Urethane Sound Speed will change as temperature changes.
If it appears impossible to remove the bend of the seafloor it may help to fix the
Urethane Sound Speed. If this is the case double click on the Urethane Sound
Speed reading on this Tab to show the Urethane Sound Speed Computations
and select Fixed.
www.wassp.com
Sea-floor Profile:
Concave
DECREASE
sound speed
value
Sea-floor Profile
Sound speed increases with increasing
Doc. P/N:
WSP-009-002
Version:
V2.3
Issue Date:
July 2014
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