Target Trails (Echo Trails); Past Plot Points - Furuno FR-1710 Operator's Manual

Past plot points

Past plot points may be marked on the dis-
play with as many as nine dots. You can turn
this display on/off as follows:
1. Press the [MENU] key.
2. Press the [7] key twice to select PLOT.
PLOT MENU 1
1. MARK DISP OFF ON
2. ERASE
3. VEC REF REL TRUE
4. VEC TIME 30S
15M 30M
5. CPA SET OFF
2NM
5NM
6. TCPA SET 30S
4M
7. TRACK OFF
8. AUDIO ALARM OFF
9. INTVAL* 30S
0. *
* Requires ATA Board ARP-17.
Figure 1-28 PLOT menu
3. Press the [7] key to select OFF or ON from
the TRACK field as appropriate.
4. Press the [ENTER/SELECT] key to reg-
ister your selection followed by the
[MENU] key to close the menu.

1.26 Target Trails (Echo Trails)

It is possible to display the trails of the radar
echoes of targets in the form of synthetic af-
terglow. Target trails are selected either rela-
tive or true and may be sea or ground
stabilized. The simulated afterglow can be se-
lected in a single tone or gradual shading de-
pending on a setting on the TGT TRAIL menu.
Note that afterglow is shown in light yellow
when the echo color is green.
True or relative trails
You may display target trails relative to north
or own ship heading in Relative Motion. True
motion trails require a compass signal and
own ship speed input to cancel out own ship's
movement and present true target move-
1-22
1M 3M 6M
0.5NM 1NM 1.5NM
3NM 4NM
6NM
1M 2M 3M
5M 6M 12M 15M
ON
ON
1M 2M 3M 6M
ments in accordance with their over-the-
ground speeds and courses.
a) True target trails-no smearing
of stationary targets
b) Relative target trails-all targets
moving relative to own ship
Figure 1-29 Target trails
Note: When relative trail on the TM mode,
the legend REL TRAIL appears in red.
To select true or relative target trail presen-
tation:
1. Press the [MENU] key.
2. Press the [2] key twice to show the TGT
TRAIL menu.
TGT TRAIL
1. TIME
2. MODE
3. SHADE
4. LEVEL
5. TRAIL COPY
6. THIN TRAIL
7. THIN MODE
Figure 1-30 TGT TRAIL menu
3. Press the [2] key several times to select
REL or TRUE from the MODE field as
appropriate.
15S 30S 1M 3M
6M 15M 30M CONT
REL TRUE
MONO MULTI
1 2 3
OFF ON
OFF ON
1 2 3 4