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7
EPA (Electronic Plotting Aid)
EPA (Electronic Plotting Aid)
The EPA (Electronic Plotting Aid) for manual plotting is interfaced for small ships fitted with a gyrocompass, speed
and distance measuring equipment.
EPA (Electronic Plotting Aid), will in order to improve the standard of collision avoidance at sea, reduce the workload
of the crew by enabling them to obtain information about plotted targets, as well as they could by manually plotting
a single target themselves.
• Max. 10 targets can be plotted on the screen.
• Plot positions shall be identified by an approved symbol mark (p. 22) and associated plot number.
• The vector origin will move across the screen at a rate and direction defined by the calculated true or relative
course and speed.
• The vector will be displayed on the target.
• External data is required for screen display information. (p.38).
EPA menu setting
Set the EPA menu items before using the EPA func-
tion.
EPA MENU
EPA
VECT
No.DISP
ALARM
CPA LIMIT
TCPA LIMIT
INT.SETTING
20
OFF
ON
TRUE
REL
OFF
SEL
ALL
OFF
ON
1.0NM
10MIN
q Push [MENU] several times to turn the EPA menu
ON.
w Push [
to turn the EPA function ON
e Push
]
the vector type.
• TRUE (True vector):
The predicted true motion of a target as the result of
your own ship's direction and speed input.
• REL (Relative vector):
The predicted movement of a target relative to your own
ship.
r Push [
to select "No. DISP" to select the tar-
get identification number type which appears at the
right side of the mark. Push
• OFF: No number appears.
• SEL: Number appears by the selected mark only.
• ALL: All numbers appear by the marks.
t Push [
to select "ALARM"; push
turn the alarm function ON or OFF.
• EPA alarm is emitted when both CPA and TCPA reaches
the limit.
y Push
to select the "CPA* LIMIT"; push
]
to set the CPA limit distance.
u Push
to select the "TCPA* LIMIT", push
]
to set the TCPA limit time.
*CPA/TCPA: Closest Point of Approach and Time to
Closest Point of Approach limit is defined by the ob-
server to a given warning when a target or targets are
close to within those limits from your own ship.
i Push [MENU] to exit the EPA menu.
to select
]
]
]
]
to
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]
]
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