1. OPERATIONAL OVERVIEW
1-10
True motion mode
Own ship and other moving objects move in accordance with
their true courses and speed. In ground stabilized TM, all
fixed targets, such as landmasses, appear as stationary
echoes. In the sea stabilized TM without set and drift inputs,
the landmass can move on the screen. Note that true motion
is not available on the 72 nm or 96 nm range scale.
When own ship reaches a point corresponding to 50% of the
radius of the display, own ship position is automatically reset
to a point of 75% radius opposite to the extension of the
heading line passing through the display center. You may
also reset the own ship symbol manually by pressing the
OFFCENTER
key.
If the heading sensor fails, the mode is changed to the head-
up and the north marker disappears. The HDG readout shows ***.* and the message “SIGNAL
MISSING HEADING” appears.
Automatic resetting of own ship mark in true motion mode
1.8
Choosing a Range Scale
The selected range scale, range ring interval and pulse length are shown at the upper left corner
on the screen. When a target of interest comes closer, reduce the range scale so that it appears
in 50-90% of the display radius.
Use the
RANGE
key to choose range desired. Hit the "+" part of the key to raise the range; the "-
" part to lower the range.
Heading Line
North Marker
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Heading
line
North
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(a) True motion
is selected
(b) Own ship has reached a
point 75% of display radius
(c) Own ship is automatically
reset to 75% of radius
