Furuno CSH-5L/CSH-8L Event Mark, Own Ship Position Mark, Event mark, How to use the event mark

3. ADVANCED SONAR OPERATION

3.6Event Mark, Own Ship Position Mark

3.6.1Event mark

The event mark, which requires speed and heading data, is useful for finding the horizontal range, depth and bearing to a location some distance from current position.

Plotting an event mark on the display is equivalent to dropping a buoy with an anchoring chain that extends from surface to bottom. The buoy is fixed at its present geographical location, but the mark on the display moves to a point where present beam plane intersects the anchor chain of the buoy as the ship moves or the tilt angle is changed. This can be said of other marks as well such as fish mark and trackball mark.

		(35)
	B	Stored when
You observe picture from		EVENT key is
		pressed.
direction of mark.	A

How to use the event mark

Entering an event mark

1.Operate the trackball to place the trackball mark where you want to place an event mark (latest event mark).

2.Press the [EVENT] key. The horizontal range, depth and bearing to the event mark appear at the bottom left corner of the sonar display.

Event mark position is calculated from ship’s speed and heading data and it moves on the screen with own ship’s movement. With connection of a navigator, the latitude and longitude of the event mark are output to the navigator when an event mark is entered, in NMEA format TLL sentence.

→234 : Horizontal range (m) from own ship mark to mark ↓ 121 : Depth (m) to mark

( 121) : Depth (m) of mark at moment EVENT key is pressed.

B SW/W : Bearing (degree)*

*Bearing format may be selected with EVENT/FISH on the MARKS menu.

**Any value which exceeds 9999 is displayed

with four asterisks (****).

Event mark data, shown at bottom left corner of the display

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