Simrad ER60, Operator'S Manual

Page: 85 / 182

Dialogue boxes and functions
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850-164692 / Rev.B
Environment
The Environment dialogue box is accessed from the Install
menu.
Purpose
This dialogue box
controls the setting of
environmental
parameters. These
parameters are used for
estimating range,
propagation loss, and
spreading loss, all of
which are essential
concepts in the echo
sounder.
The absorption coefficient can be recalculated and displayed for
various frequencies to examine the effect of temperature,
salinity, and sound speed parameters on this parameter.
Conditions
Use these spin boxes to provide manual values for temperature
and salinity. If you operate in fresh water, set salinity to 0
(zero).
Sound speed
Tick Calculate if you wish the echo sounder to calculate the
sound speed value based on the specified temperature. If you
select
Manual , you can use the spin box to enter a value.
Absorption
Select the frequency in the top spin box, and read the
corresponding absorption value. This input has no effect on the
echo sounder, it is simply a calculator!