JMA-9172-SA Instruction Manual > 3.BASIC OPERATION > 3.4 GENERAL RADAR OPERATION
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3.4.8 Display Radar Trails (Trails)
Other ship's movements and speeds can be monitored from the lengths and
directions of their trails, serving for collision avoidance. The trail length varies
according to setting.
3.4.8.1 Changing the length of the trail
1) Left-click the Radar trails display time button located at the
upper left of the display.
Values of the length of the radar trails are switched.
Trails length setting: Short mode
→ → →
← ← ←
Saved trails cannot be erased even when the trail lengths are changed by using Trails button.
Even after the trails display is turned off, the past trails can be displayed traced back by
setting a desired time.
The radar system is start transmission, trails is start plot.
The system is plotting trails even while the trails display is off.
If the transmit time is short, the indicated trails duration may not have achieved the specified
time. The radar trails remaining time is indicated at the right of the trails length setting.
3.4.8.2 Erasing Trails Data
1) Hold down the Trails button for five seconds located at the
upper right of the display.
All the saved trails data will be erased. The system starts plotting trails in initial state.When
Trails button is clicked for 2 seconds, a RADAR Trails Setting menu will be displayed.
Furthermore, data will be erased if it continues pushing.
Short
：
15sec, 30sec, 1min, 3min, 6min, 10min and 15min
Middle
：
30sec, 1min, 3min, 6min, 10min, 15min and 30min
Long
：
1min, 3min, 6min, 10min, 15min, 30min and 60min
RADAR trails display time
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