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Clearing Lines
Clearing lines are bearing lines or range lines
used to approximate a position where a danger
to own ship lies.
The clearing line bearing or range value is used
to navigate around the dangerous area such that
the mariner would want ownship to remain no
less than or no greater than the range or bearing
of the clearing lines.
The Clearing Lines sub menu includes the following tab folders:
•
Editor
•
Monitor
•
I/O
The Editor tab enables you to create, save, open, edit and delete one or
more sets of clearing lines.
The Monitor tab enables you to select a previously saved set of clearing
lines for monitoring against own ship's course.
The I/O tab enables you to import or export sets of clearing lines to and
from an external device such as a USB memory stick.
Editing Clearing Lines
There are two types of Clearing Line available:
•
Bearing Line
•
Range Line
Bearing lines are drawn as a single solid line with an arrowhead towards
the line's bearing. Range lines are drawn as a single arc with arrowheads
on both the start point and end point of the arc line.
The clearing line bearing or range value
is shown in the same colour beneath
the line. The clearing line may also
include a label defined by the operator.
A clearing line may be selected as a Not
More Than (NMT) or Not Less Than
(NLT) value. For example, in the figure
below the mariner would want to keep
the ship's bearing no less than 294.2º
and no more than 315.2º to stay in safe
water.
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ECDIS User Guide
65900012
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Questions and answers
HI THERE , I COULD NOT FIND THE MOB BUTTON IN THE UPPER TOOLBAR AND IN NAV TOOLS , AND THE VIDEO PLAYBACK BUTTON ON IUR SPERRY MARINWE ECDIS.
The MOB (Man Overboard) button can be found in the upper toolbar of the Sperry Marine VisionMaster FT ECDIS. It has a yellow background when the MOB event is active and a standard background color when inactive. However, there is no information provided in the context regarding the location of a video playback button.
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WHAT IS THE PROCEDURES IN MAKING PARALLEL INDEX USING SPERRY MARINE ECDIS
To make a Parallel Index (PI) using Sperry Marine Visionmaster FT ECDIS, follow these procedures:
1. Access PI Lines: Left-click on the "Parallel Index Lines" field in the NAV Tools menu.
2. Use the PI Lines Window: This window has three tabs:
- Edit Tab: Add a new PI line or set, copy, delete, rename, or realign lines to the ship's current heading.
- Display Tab: Select which PI lines to display.
3. Define Each PI Line: Set the following parameters:
- Range from the closest point to own ship
- Bearing
- Line type
- Side of the ship (port or starboard)
Up to fifteen PI lines can be displayed at once across the entire chart display in all modes.
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