Furuno FSV-84 manual Sample History Display, History mode concept

6. HISTORY MODE

6.2Sample History Display

The history display shows echo data for the echoes within the history marker, which is a 120° arc centered on the own ship position on the horizontal display. The history marker scrolls downward on the history display – the latest echoes at the top and the oldest at the bottom. Echoes are averaged for three transmissions for easy viewing. This mode is useful for watching echo condition over a period of time.

Use the trackball to select location for the history marker. When the tilt angle is changed, the slant range is automatically changed to keep the history marker at a constant depth; however, like an echo sounder, the picture inscribed before the tilt angle was changed is not refreshed.

N
NUMERIC/GRAPHIC
DATA DISPLAY
→ 560m	150
↓ 51m
	0
History	25
markerW	EE
S

Horizontal Display History Display

History display

B

D

A

C

History marker

B A

Depth

History marker and echo location

B A

C

D

History mode concept

6-2