Furuno FSV-75, Operator'S Manual

Page: 67 / 235

2. SLANT MODE
2-33
2.19 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. There are two types of the event marks:
event mark 1 (
) and event mark 2 ( ). Up to 20 marks can be entered.
This function requires appropriate data input. For details, see "DATA INPUT
REQUIREMENTS" on page AP-12.
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.
2.19.1 How to enter an event mark
1. Place the cursor where you want to enter an event mark.
2. Press an
EVENT key. The appropriate mark appears and the horizontal range,
depth and bearing to the event mark appear at the bottom left-hand corner of the
horizontal display area.
With speed and heading data the mark follows own ship’s movements. 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 anchoring 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.
Note: With factory default settings, you can use the right button to enter event mark1.
,
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.