Table of Contents
Advertisement
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 position 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 enter 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 also be entered by pushing the right 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, the present
depth to event mark changes. 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
You observe picture from
direction of
mark.
2. HORIZONTAL MODE
key is pressed
(35)
Stored when
B
EVENT key is
pressed.
A
2-33
Advertisement
Table of Contents
