Simrad ER60 - REV B Operator's Manual page 33

Figure 1 Sound
speed in water
850-164692 / Rev.B
Procedures
Check installation
1 Check that the ER60 and all the transceivers and
transducers are installed correctly, and that they are all
fully functional.
2 Measure water salinity and temperature and enter these
data in the Environment dialogue box.
- The sound velocity is automatically calculated by the
echo sounder.
- The corresponding absorption coefficient is calculated
by the echo sounder according to Francois & Garrison,
JASA December 1982.
3 Use the ER60 to check that operation in Normal mode
functions properly for all transducers.
Sound speed (in m/s) (at depth 0 m)
1550
1500
1450
1400
0 5
(CD467 / GIF / WMF)
Anchoring
The following rigging description is to a great extent reproduced
from ICES report 144.
1 Find a location with calm and sheltered water.
- Avoid areas with large differences in tidal height, as
this gives strong tidal current. Also, avoid areas near
river mouths and harbours with heavy traffic. An area
with little or no fish present is favourable.
2 Ensure that the depth is sufficient for separation of sphere
and bottom echoes.
Salinity 40
Salinity 0
10 15 20
o
Water temperature (in C)
Operational procedures
25 30
25