6. HISTORY MODE

6.3.2Setting 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.

(3) d

 

d

The slant range is automatically changed whenever￿

 

 

r

the tilt angle is changed, to keep the history marker￿

 

 

 

 

 

at a constant depth. When a shallow tilt angle is used,￿

(2)

 

(1)

 

 

 

the picture inside the history marker is ￿

 

 

R

 

 

from (1)(2)(3), according to tilt angle.

 

 

History marker

 

 

 

 

 

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

Slant range and tilt angle

6-4

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Image 178
Furuno FSV-84 manual Setting the history marker, Slant range and tilt angle