Introduction

The Helicopter Approach Sector and Station Keeping facilities, described in this chapter, are additions to the Tools features described in Chapter 12 of the BridgeMaster E User Guide 65800010A.

Accessing the TOOLS Menu

1.	Position the screen cursor over the TOOLS soft key.

2.	Left click to reveal the TOOLS menu and associated soft keys.

See example left.

Note - The standard facilities available from the Tools menu are described in the Chapter 12 of the BridgeMaster E User Guide 65800010A.

Note - A left click on the EXIT TOOLS soft key will close the menu.

Helicopter (Helo) Approach Sector

The Helicopter Approach Sector facility is used to aid the operator in guiding a helicopter to land. This facility is available in all stabilised modes.

The sector is displayed as three radials spaced at 15º apart, with small calibration circles drawn on the centre line (the sector bearing line). The circles are spaced at intervals determined by the current range ring selection. The radials extend from the origin to the edge of the video circle, and are displayed as green dashed-lines. The sector origin can be either Own Ship or any Tracked Target.

If the origin is Own Ship, the orientation can either be set to a true value (Fixed with respect to north) or to a relative value (with respect to ship's head). If the sector origin is a Tracked Target, it is always set to a true bearing.

Turning Helo Sector Graphics ON or OFF

1.	Position the screen cursor over the HELO SECTOR soft key located under the Tools Menu.

2.	Right click to toggle the display of graphics ON or OFF.

Note - the Helo Sector graphics will only be displayed if currently set to DISPLAY ON in the HELO SECTOR menu.

Accessing the HELO SECTOR Menu

1.	Position the screen cursor over the HELO SECTOR soft key located under the Tools Menu.

2.	Left click to reveal the Helo Sector menu. See example left.

Note - A left click on the EXIT HELO SECTORS soft key will close the menu.

Turning Helo Sector Display ON or OFF

1.	Within the menu, position the screen cursor over the DISPLAY line.

2.	Left click to toggle the display ON or OFF.

Selecting TRUE or RELATIVE Display Mode

1.	Within the menu, position the screen cursor over the MODE line.

2.	Left click to toggle the display to TRUE or REL.

A prompt will be displayed if the sector origin is not Own Ship

Selecting the Helo Sector BEARING

1.	Within the menu, position the screen cursor over the T BRG

(or R BRG) line.

2.	Left click to access.

Bearing line in menu is displayed in yellow.

3.	Move the cursor control left or right to change the bearing.

4.	Left click to accept new bearing.

Alternatively a right click on the T BRG (or R BRG) line will reveal a drop down keypad from where a new bearing can be entered. Refer to Chapter 15 in User Guide if further information on drop down keypads is required.

Selecting the Helo Sector ORIGIN

1.	Within the menu, position the screen cursor over the ORIGIN line.

2.	Left click to toggle the origin to OWN SHIP or TARGET.

Note - If the radar is a static site the OWN SHIP text is replaced by RADAR HEAD.

If OWN SHIP is selected as the sector origin, the line immediately below the ORIGIN line will be blank. If TARGET is selected, the line will be 'TARGET No nn'. Where nn is the ID number of a selected target, or '--' if no target has yet been selected.

Selecting a Specific TARGET as Sector Origin

1.	Within the menu, position the screen cursor over the TARGET NO	line.

2.	Left click to access.

This will force the screen cursor into the video circle and the user is prompted to select a target.

3.	Within the video circle, position the cursor over the required target.

4.	Left click to select the target as the sector origin.

The ID of the selected target will appear in the Helo Sector menu. The screen cursor is also returned to the menu.

Note - While the screen cursor is within the video circle, a right click will exit and return the cursor to the Helo Sector menu without making a selection.

Alternatively a right click on the TARGET NO line will reveal a drop down keypad from where the ID number of the required target can be entered. Refer to Chapter 15 in User Guide if further information on drop down keypads is required.

Sector Defaults and Suppression

By default the display of the sector is set to OFF, with its origin on own ship and north stabilised. Its bearing is set to 195º relative to ship's head.

The sector is switched OFF if the radar is switched to standby. The sector display is temporarily suppressed if the presentation mode is switched to unstabilised, or the compass is not aligned or there is a compass alarm. The sector ON/OFF state is unaffected while the display is suppressed. A appropriate prompt is raised if an attempt is made to switch the sector ON in any of the above conditions.

Warning Prompts

A suitable prompt is displayed if either method of selecting a target fails to find a tracked target.

Station Keeping

The Station Keeping facility allows the radar operator to check that vessels in a convoy are keeping their correct position with respect to each other. The facility allows the operator to draw a number of lines which are displayed in the video circle, showing the intended relative positions of the vessels while they are sailing in convoy.

The graphics drawn by the operator stay in the same position relative to own ship, and rotate when own ship turns. Station Keeping graphics can be saved and retrieved from a memory card.

The Station Keeping facility is NOT available in STANDBY mode.

Turning Station Keeping Graphics ON or OFF

1.	Position the screen cursor over the STATION KEEPING soft key located under the Tools Menu.

2.	Right click to toggle the display of graphics ON or OFF.

Note - the Station Keeping graphics will only be displayed if currently set to DISPLAY ON in the STATION KEEPING menu.

Accessing the STATION KEEPING Menu

1.	Position the screen cursor over the STATION KEEPING soft key located under the Tools Menu.

2.	Left click to reveal the Station Keeping menu. See example left.

Note - A left click on the EXIT STATION KEEPING soft key will close the menu.

Turning Station Keeping Display ON or OFF

1.	Within the menu, position the screen cursor over the DISPLAY line.

2.	Left click to toggle the display ON or OFF.

If a graphics file has been loaded from a memory card, the line immediately under the DISPLAY caption will show a file name and extension. If no graphics file has been loaded the line will be dashed out (-:--------.---). See Loading a Graphic from a Memory Card later in the chapter.

Creating the Station Keeping Graphics

The Station Keeping graphics are created by a process referred to as 'rubber banding'.

1.	Position the screen cursor over the ADD LINE caption in the STATION KEEPING menu.

2.	Left click to access the edit mode.

The ADD LINE caption in the menu will be displayed in yellow.

3.	Within the video circle, position the cursor at the point where the graphic is to be started.

4.	Left click to anchor the start point.

5.	Move the cursor to the second point.

Note that the graphic line is drawn as a dashed red line from the anchor point to the cursor, and follows the cursor as it is moved.

6.	Left click to anchor the line at the second point.

Note that a line is now set between the two anchor points. The second line follows the cursor as it is moved.

7.	Repeat steps 3 to 6 as often as required.

The current line (the one anchored to the cursor) can be terminated by a right click, a left click at the line's fixed anchor point, or by selecting a different edit line from the menu.

Note - the graphics can be any shape or size desired by the operator. It can be a number of boxes (around individual vessels) or a single box around the whole convoy. It could also consist of a single line through each vessel, see examples on next page. The maximum number of lines in a single graphics file is limited to 50.

A second left click on the ADD LINE caption will terminate the current edit mode, and return the caption text to its original colour.

Removing a Line from a Displayed Graphic

1.	Position the screen cursor over the DELETE LINE caption in the STATION KEEPING menu.

2.	Left click to access the delete mode.

The DELETE LINE caption in the menu will be displayed in yellow.

3.	Within the video circle, position the cursor over the line to be deleted.

4.	Left click to delete the line.

5.	Repeat steps 3 and 4 as often as required.

A second left click on the DELETE LINE caption will terminate the current edit mode.

Removing All Lines from a Displayed Graphic

1.	Position the screen cursor over the DELETE ALL caption in the STATION KEEPING menu.

2.	Left click to remove all lines.

A dialog box requesting confirmation will appear, see example left.

3.	Within the dialog box, click on ACCEPT to remove all lines.

Note - This action only deletes the lines from the screen, it does not delete the lines from the Group file on the memory card.

A second left click on the DELETE ALL caption will terminate the current edit mode.

Saving a Graphic to a Memory Card

1.	Position the screen cursor over the SAVE soft key located under the menu.

2.	Left click to access.

This action will reveal a standard alphanumeric keypad with the name of the last graphics file loaded (if any) as a default.

3.	Use the keypad to save the file. See Chapter 15 in the User Guide.

The operator will be prompted to confirm a selection if the save will cause an existing file to be overwritten.

Loading a Graphic from a Memory Card

1.	Position the screen cursor over the LOAD soft key located under the menu.

2.	Left click to reveal a list of the Station Keeping graphics files available for loading.

The list is for a particular file card (A or B) and contains the filenames of the Station Keeping graphics available for selection, see Chapter 15 in the User Guide.

3.	Left click on the file required.

Note - Once a Station Keeping file has been loaded from a memory card, that card can be removed without affecting the displayed graphics. The loaded file will remain in the radar's volatile memory until the radar is switched off.

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