JRC JMA-5104, Инструкция по эксплуатации, Страница: 83 / 242

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Note
Even if the center of the PPI screen is moved, this radar does not erase the images on the PPI screen
including the display of trails and the likes.
You can observe the heading of another ship at any time by freely moving the center of PPI screen.
Caution
●
● ●
● The center of the PPI screen can be moved by up to 90% of the maximum screen
radius. If the center is moved by the allowable maximum into the SHM
direction, the observable range of targets in the heading direction becomes too
small, which is dangerous.
The center of the screen should be moved into the SHM direction for short
observation such as confirmation of another ship's position.
3. Continuously moving the center
To continuously move the center of the PPI screen, operate
[TRACK BALL]
while pressing the
[OFFCENT]
key. When deciding a position as the new center, release the
[OFFCENT]
key.
Moving of the center stops.
4. Canceling the position as the new center
To return the center of the screen to the original, press the
[OFFCENT]
key again. The center
of the screen returns to the original.
3.5.9 Using the trail display function [TRAILS]
Displaying radar trails
The heading of another ship can be confirmed by the trail length and direction. This feature
assists in avoiding ship collision.
Timing trail display, continuous trail display, or combination of timing trail display and
continuous trail display can be selected for the trail length of the radar.
- Timing trail display :
A value 30 to 59 seconds or 1 to 99 minutes can be set for the trail length.
- Continuous trail display :
The trail length is unlimited.
- Timing trail d continuous trail display :
The trail length is set in combination of the two modes above.
Even while the trail display function is set to OFF, the trail storage function is always working.
Thus, you can display trail data through one-touch operation whenever you want to.
1. Setting the trail display function to ON/OFF [TRAILS]
(a) Press the
[TRAILS]
key. The display changes in the following sequence:
Display OFF → display ON (timing trail display) → display ON (continuous trail display)
→ display ON (timing trail d continuous trail display) → display OFF.