7. Select the Leg Time box and enter the amount of
time that it should take to complete the rst leg.
The Track Spacing is calculated automatically
using the specied Search Speed and Leg
Time. Subsequent leg times are calculated
automatically.
8. Select the Number of Legs box and enter the
total number of legs for the pattern.
9. Double check your settings.
10.Select Create Pattern.
The Pattern will now be created as a Route ready
for you to follow.
Note: The rst waypoint after the CSP waypoint
will always be towards the specied drift direction.
Drift effects on Expanding Square
search patterns
As the search patterns account for tidal drift the
resulting Route may not resemble the pattern shown
above.
Example Drift
Direction: 0°
Speed: 0 Kts
Direction: 45°
Speed: 0 Kts
Direction: 0°
Speed: 0.5 Kts
Direction: 0°
Speed: 1 Kts
Creating a Creeping / Parallel Line
pattern
The Creeping / Parallel Line search pattern covers
a rectangular area, the area is searched either by
starting at one end of the search area (Creeping)
which provides greater coverage of one end but will
take time to cover the whole area, or by searching
the area lengthways (Parallel) which provides
reasonable coverage of the area quickly. The
Creeping Line search should be used when there is
a logical end of the search area to start your search
from.
To create a Creeping / Parallel Line search pattern
follow the steps below:
1. Select Search Patterns from the Navigate menu:
(Menu > Navigate > Search Patterns).
2. Select Creeping / Parallel Line Search.
3. Select the Commence Search Point box.
4. Enter the latitude and longitude for the starting
point of the search pattern.
By default and after a power cycle the coordinates
shall be set to zeros. If you have already created
a search pattern then the last used Commence
Search Point (CSP) position is displayed.
The position of the CSP in relation to the
coordinates for ‘A’ shall determine whether a
Creeping Line or Parallel Line search pattern is
created.
5. Enter the coordinates for the 4 corners of the
search pattern labelled A, B, C and D.
If the coordinates are suitable to create the
search pattern then the Creep Direction is shown.
6. Select the Track Spacing box and enter the
distance between each line.
7. Select the relevant Line Type.
8. Double check your settings.
9. Select Create Pattern.
The Pattern will now be created as a Route ready
for you to follow.
The table below shows both Creeping Line and
Parallel Line search patterns which have been
created using the same corner point coordinates.
Chart application
175
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