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6. HISTORY MODE
6-4
6.3.2 Setting the history marker
Use the trackball to locate the trackball marker on the horizontal display and
then press the [R/B AUDIO] key. The history marker moves to the trackball
marker and is centered on the ship’s bow, extending 60° in both port and
starboard directions. Own ship mark is fixed at own ship position. The slant
range is automatically changed whenever the tilt angle is changed, to keep the
history marker at a constant depth. When the tilt angle is shallow and the slant
range to the history marker is greater than the range set with the RANGE control,
the sampling point becomes the range in use.
R
(1)
(2)
(3)
History marker
r
d
d
R: Range (Range set by RANGE control)
r: Slant range to history marker, set with trackball. Automatically changes with tilt angle.
d: Depth (constant) to history marker
The slant range is automatically changed whenever
the tilt angle is changed, to keep the history marker
at a constant depth. When a shallow tilt angle is used,
the picture inside the history marker is
from (1)→(2)→(3), according to tilt angle.
Slant range and tilt angle