10.3 Expanding square search pattern
The Expanding Square search pattern is an outwards spiralling square
pattern, and is particularly suited to very detailed and methodical searches.
Note:
The Search patterns take drift into account, and therefore the resulting
route may not resemble the patterns shown.
Creating an expanding square search pattern
To create a Expanding Square search pattern follow the steps below:
1. Select
[Expanding Square]
from the
[Search Pattern]
options:
[Chart app
> Menu > Navigate > Search patterns]
2.
Set Commence Search Point (CSP)
i.
Manually input the
[CSP]
coordinates; a
[Range]
and
[Bearing]
are
displayed to direct your vessel towards it.
ii. Alternatively, set the
[CSP]
as your vessel’s current location by
selecting the
(1)
[CSP Shortcut]
button.
3.
Set Drift
i.
Drop the
[Datum Marker]
in the water and select
[Marker dropped]
.
ii. Wait for the
[Datum Marker]
to drift through the water.
iii. Return to the
[Datum Marker]
in the new location and select
[Drift
position]
to calculate the
[Set (Direction)]
and
[Drift (Speed)]
.
iv. Alternatively, you can use your vessel’s
[Heading]
and
[SOG]
to define
the set and drift by selecting the
(2)
[Set / Drift shortcut]
icon.
4.
Set Track spacing / Radius, Search Speed, and Leg time
[All 3 variables are dependent on each other. One variable is always the
product of the other two.]
i.
Select one of the variables by selecting the
(3)
[Output]
icon.
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