Furuno FSV-85, Operator'S Manual

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2. HORIZONTAL MODE
2-34
2.18 Event Mark, Own Ship Position Mark
The event mark is useful for finding the horizontal range, depth and bearing to a loca-
tion some distance from current position. 20 such marks may be inscribed on the hor-
izontal display. This function requires speed and heading data.
There are two types of event marks, latest event mark 1 ( ) and event mark 2 ( ).
Each time an event mark is entered the latest event mark appears at the cursor posi-
tion and all other event marks are shown by marks
and numbered in sequential
order. When the memory capacity for event marks is reached the earliest event mark
is automatically erased to make room for the latest.
2.18.1 How to enter an event mark
1. Set the cursor where you want to place an event mark.
2. Press an
EVENT key. The horizontal range, depth and bearing to the event mark
appear at the bottom left corner of the horizontal display area. The event mark 1
can be entered by pushing the right-click button.
With speed and heading data the mark follows own ship’s movements. In the True Mo-
tion mode, the event mark is stationary. When the tilt angle is changed mark position
changes with slant range. Note however that the mark’s position does not change
when automatic tilt is active; the tilt center angle is used to position the mark.
Plotting an event mark on the display is equivalent to dropping a buoy with an anchor-
ing chain that extends from surface to bottom. The buoy is fixed at its geographical
location, but the marker on the display moves to a point where the present beam plane
intersects the anchor chain of the buoy as the ship moves or the tilt angle is changed.
This can be said about marks as well such as fish mark and cursor.
,
234m: Horizontal range (m) from own ship mark
19m: Present depth (m) to mark
(35m): Depth (m) of mark at moment EVENT key is pressed.
B 265
°
: Present bearing (degree)
Bottom left-hand corner of the screen
Ex. Indications when the EVENT key is pressed
(35)
Stored when
EVENT key is
pressed.
A
B
You observe picture from
direction of mark.