Raymarine Ray 106 User's Guide download pdf (Page 89)

Chapter 10: Working with radar (Non-HD Digital) 79

MARPA automatically tracks acquired targets, calculates target bearing

and range, true speed and course, Closest Point of Approach (CPA) and

Time to Closest Point of Approach (TCPA).

Each tracked target can be displayed with a vector depicting approximate

target speed (vector length) and course (vector direction). The target data

can be displayed on-screen in the MARPA Target databox, each target is

continually assessed, and you are warned if one becomes dangerous or is

lost.

Effective MARPA operation is dependent on the accuracy of your own ships

heading data, plus Speed over Ground (SOG) and Course Over Ground

(COG). The better the quality of the heading data, the better MARPA will

perform. MARPA will function without SOG and COG data, but only rela-

tive vector, CPA and TCPA are shown; target course and speed cannot be

calculated.

Risk assessment

Each target is displayed as a symbol to indicate its status:

Each target is monitored to determine if it will be within a certain distance

from your own boat within a certain time. If so, the target is designated as

dangerous, and you are notified with an audible alarm and a flashing on-

screen ‘MARPA target (ID No.) Dangerous’ warning. Press any key to

cancel the alarm and remove the warning; however, the target is

dangerous symbol remains displayed. Both the distance (Own Vessel Safe

Zone) and the time (Time to Safe Zone) are selectable.

If a target is lost, it is either because the MARPA software has lost contact

with it, or it has moved out of range. If this occurs, you are notified with an

audible alarm and an on-screen ‘MARPA target (ID No.) lost’ warning.

Press any key to silence the alarm and remove the message and lost target

symbol from the screen.

MARPA range

MARPA target acquisition is only available at radar range scales of up to 12

nm, although tracking continues at all ranges.

If you change to a smaller range scale, targets may be beyond the range of

your scanner and will be lost. In such cases, an on-screen warning will indi-

cate that the target is off-screen.

Target and vector history

You can display MARPA targets with a vector line showing where they will

be at a certain time in the future (assuming their present course and speed

remains unchanged). You can select a relative or true vector, and the

vector length.

Relative vector

A relative vector indicates the target’s motion relative to your own boat’s

motion. The target’s relative course and sped are calculated to produce a

Target is being acquired

Target is safe

Target is dangerous

Target is lost

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Raymarine Ray 106 User's Guide Page 89

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