Precision Anchoring, Continued
Before constructing the anchorage plot, it is always wise to draw a
Constructing the swing circle of estimated radius around the designated anchorage site to
check whether any charted hazards will be in close proximity to the ship
at any time as it swings about its anchor. If any such known hazards
are located either within or near the swing circle, an alternate anchorage
should be requested.
If the anchorage appears safe, the navigator begins the anchorage plot by
selecting the approach track. During this process, due regard must
always be given to the direction of the predicted wind and current
expected in the vicinity of the anchorage. Insofar as possible, the
approach should always be made directly into whichever of these two
forces is predicted to be strongest at the approximate time at which the
anchorage is to be made.
Constructing the Use the following table to construct an anchorage:
Select the approach track by considering the different objects available for a
head bearing, taking into account the expected winds and current in the bay.
Assuming negligible current and a northerly wind, the tower in figure 12-8 is a
good choice for a head bearing.
Figure 12-8. W-5 anchorage assignment.