Chapter 4 Menu operations MDC-2200/2500 Series
0093125002-05 4-14
“Position” calculates movement distance from course and latitude/longitude.
“Position” selection is effective to obtain stable trail under rough current where error of speed sensor is
large,
(9) Rel mode (Relative bearing criteria)
This is to select the signal (ship’s bearing or true) as criteria to record trails, in case trail mode is used
as “REL”.
Ship’ bearing: Trails are recorded taking the ship’s bearing as criteria.
The echo moving by own ship’s turn remains as trail.
True : This is active when such a bearing sensor as gyro, GPS compass is connected,
to record trails based on the true bearing from the bearing sensor.
The echo moving by own ship’s turn is not recorded as trail. When compared with
the ship’s bearing criteria, trail image is clearer and it is easier to see the relative position
with the other vessel.
(10) Trail detection level (1 to 6)
Designate trail display image strength selecting from value 1 to 6.
1 display trail even from weak image signal.
6 display trail only from strong image signal.
IMPORTANT: Lower detection level may display trail only in the position where target is not shown on
the screen.
(11) Interference rejection (IR)
Other ship’s radar of the same frequency band may cause interference noise on the screen. This
interference effect is not uniform but in most cases spiral or radius shape. This device provides
interference removal function to reduce these effects.
• Designate value is [Off, 1, 2, 3, 4, 5] and large value is for stronger removal effect.
• Too strong interference removal may mask small target.
(12) Display target stable using signal processing.
Observation of target in wave or target in long distance can be displayed stable by using signal
processing.
3 types of setting are provided for signal processing.
PROCESS 1 Residual mode (weak) Display stably the target appearing/disappearing on the screen.
PROCESS 2 Residual mode (strong) Same as above but effective for long distance target.
PROCESS 3 Correlation mode Suppress sea reflection and highlight target.
Note: Gain, Anti-sea, Anti-rain adjustment can not be reflected immediately during signal processing in
use.
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