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3.4 BASIC OPERATIONS
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……Select Pulse Length PULSE LENGTH …………………………
The transmission pulse length can be changed over in three levels ( SP, MP and LP)
every time the [PL] switch is pressed. The selected pulse length is indicated at the upper left of the
radar display. The pulse length can be changed only when the range is set to one of 0.75, 1.5, 3, 6 and
12 NM. If SP is selected, the range resolution increases, making small targets clearer. If
LP is selected, the range resolution decreases, but the sensitivity increases, making small
targets larger with higher definition.
……Select Bearing Display Mode AZI MODE ………………………
The bearing presentation mode is changed over in the order of [NORTH UP] (true bearing),
[HEAD UP] (relative bearing) and [COURSE UP] (course-up bearing) mode every time the [AZI
MODE] switch is pressed. When the currently selected mode is North-up or Course-up, it will
be changed over to Head-up by pressing this switch, and to another mode by pressing this
switch once again.
(Example) RM H UP/RM N UP/RM C UP/RM H UP
True Bearing Mode [NORTH UP]
The video is displayed so that the zenith of the PPI (0° on range rings) points to the due north.
Fixed targets do not flicker and are easily identified on a chart, and the true bearing of a target can
readily be read out.
Relative Bearing Mode [HEAD UP]
The video is displayed so that the ship’s heading line points to the zenith of the PPI (0° on range
rings). Since targets are displayed in their directions relative to the ship’s heading line, the
operator can watch the video in the same field of view as in operating the ship at sea.
This mode is suitable for ocean sailing and for watching over other ships.
Course-Up Mode [COURSE UP]
By pressing this switch, the ship’s heading line is fixed pointing to the zenith of the PPI (0° on
range rings). In the same way as in the North-up mode, fixed targets do not flicker, but stabilized
even if the ship is yawing. The bearing of the heading line varies by the same shift of own ship’s
course. If the course is changed, the heading line can be reset to the Course-up mode by pressing
the switch several times.
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