Simrad ER60 - REV B Operator's Manual page 35

Figure 3
Rigging a vessel
for sphere
calibration
850-164692 / Rev.B
2 Place the second and third winches on the same vessel
side as the transducer and at equal distances from the
transverse section containing the transducer and first
winch.
WINCH 3
Each winch must be provided with a long spool of 0.60 mm
diameter monofilament nylon line, which is marked with small
swivels at 5 m intervals, beginning 10 m from the loose end.
The purpose of the swivels is threefold:
• to unravel rotation of the nylon line
• to mark distances on the line
• to add weight so that the line sinks in water
Attaching the sphere
1 Locate the rope pulled beneath the hull before anchoring.
2 Use this rope to pull the line from the first winch beneath
the hull to the side with the second and third winches.
3 Attach the appropriate sphere, with affixed loop, to the
three suspension lines.
WINCH 1
WINCH 2
Operational procedures
27