User's Manual

Menu Mode
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above. It is the responsibility of the user to determine how
close another vessel may pass without being dangerous,
and how quickly the user can react to manoeuvre their own
vessel to avoid a collision.
To activate the “CPA/TCPA” alarm, highlight it and press the  MENU
or ► key. A tick will appear in the box, to indicate the alarm is now
active and using the values shown.
To change “CPA Value” use ▲▼ keys to highlight it then press the
 MENU or ► key to select it. The value field is now highlighted. Fig. 5.12.
Use ▲▼ to cycle through the predefined values and select an appropriate
one, (30ft – 8.1nm or equivalent in selected units), then press  MENU
or ◄ to accept it. The cursor returns to highlight “CPA Value”.
Press ◄ to exit and return to the previous menu.
To change “TCPA Value” use ▲▼ keys to highlight it and press the 
MENU or ► key to select it. The value field is now highlighted.
Use ▲▼ to cycle through the predefined values and select an appropriate
one, (5 min – 95min), then press  MENU or ◄ to accept it. The cursor
returns to highlight “TCPA Value”.
If the calculated values are less than or equal to the values set by the user,
an alarm condition will exist.
5.5.1.2 Guard Zone
This option allows you to set a perimeter around your vessel. When
activated a red ring will appear around your vessel in the display, labelled
Fig. 5.12 - CPA/TCPA values