Furuno FR-2105-B - Manual (Page 47)

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Target 2 is on a collision course as the extension of the vector goes through the own ship
position. Placing the offset EBL will be a help for assessment. TCPA is counted up to 99.9
min and beyond this it is indicated as TCPA > 99.9 MIN.
Note: EPA requires own ship's speed input (automatic or manual) and a heading signal. The
vector and data is updated automatically every 1-2 scenes between plot entries, but do not
neglect to plot a new position over a long period of time. The accuracy will be reduced. Note
the plots will be lost when the compass fails; start the plotting exercise again.
Plotting a target
To perform electronic plotting:
1. Place the cursor(+) on a target of interest by operating the trackball.
2. Press the ACQ key and one of numeric keys, and the plot symbol with number appears at
the cursor position.
3. Watching the EPA time shown at the upper right margin of the screen, wait for at least 30
seconds. Place the cursor (+) on the target at its new location, press the ACQ key, and the
same numeric key for the target.
The plot symbol moves to the new target position and previous position is marked by a
small dot.
4. To acquire other targets, repeat the above steps selecting different plot number.
Note: If a target once plotted is not plotted again within 10 minutes, the warning "UPDATE
PLOT" will appear in red on the upper right margin of the screen and the plot symbol of the
target flashes. If you want to continue plotting this target, reacquire it within 5 minutes.
Otherwise, the target will be regarded as a "lost target" and its plot symbol and target data will
be erased. The larger the plotting interval, the less accurate the plotted target data. Plotting of
each target should normally be made every 3 or 6 minutes as far as possible. You can use a
Watch Alarm to warn yourself every 3 or 6 min or whichever you may set.
Within 5 seconds, you can cancel a last plot by CANCEL key and make a re-entry at a
different position. After 5 seconds, the last entry is processed to produce a vector.
True or relative vector
Vectors can be displayed relative to own ship's heading (Relative) or with reference to the
north (True). Press the VECTOR key to select the required mode. This feature is available in
all presentation modes (gyrocompass must be working correctly). The current vector mode is
indicated at the upper-right corner of the screen.
Vector time
Vector time (or the length of vectors) can be set to 30 seconds, 1, 2, 3, 6, 12, 15 or 30 min and
the selected vector time is indicated at the upper-right corner of the screen.
1. Press the PLOT MENU key, and [1] key several times until the desired vector time is
reached.