Simrad ES80 Reference Manual page 343

Description
In order to obtain accurate depth
readings and fish echoes, it is very
important that the sound speed
through the water is set correctly.
Several parameters are required to
calculate the correct sound speed
value. If these parameters are not
known to you, use the default value
1494 m/s. This is a typical mean
value for sound speed.
Details
Conditions
Use this setting to set up the
ES80 for operation in fresh or
salt water.
Sound travels with different
speeds in salt and fresh water. For this reason, it is important that the ES80 knows
your water profile.
The default setting is Salt.
Parameters
Use these settings to provide manual values.
•
Temperature
Provide the current water temperature. Once the salinity and temperature
information is provided, the ES80 calculates the sound speed and absorption.
Input any temperature between 0 and +40 °C.
•
Salinity
Provide the current salinity. Once the salinity and temperature information
is provided, the ES80 calculates the sound speed and absorption. Input any
salinity value between 0 to 40 PSU.
Sound Speed
In order to obtain accurate depth readings and fish echoes, it is very important that
the sound speed through the water is set correctly.
•
Calculated
Select
Calculated
absorption based on the parameters you have supplied.
•
Manual
406273/C
to allow the ES80 to calculate the sound speed and the
Functions and dialog boxes
341