Furuno FSV-30 Operator's Manual page 145

TARGET VECTOR: This is a line extending from target lock mark which shows
speed and direction of tracked fish school. See the illustration below for
appearance.
FISH TRACK PLOT: Traces target movement in target lock. Requires ship's
speed and course data.
FISH HISTOGRAM: Shows signal strength distribution for the fish school(s)
marked with an estimate mark on the horizontal or echo sounder display. For
further details see page 6-4.
MARK SIZE menu
This menu lets you select the size or the marks appearing on the horizontal
display.
TRACKBALL MARK: Selects size and appearance of trackball mark. The
choices are large and small "+" mark, and large and small " " mark.
TARGET LOCK MARK: The target lock mark size is available in large and
small.
Fish track plot
Target lock mark
MENU
OTHERS
INITIAL SETTING
MARK SIZE
TRACKBALL MARK : +SMALL
TARGET LOCK MARK : SMALL
TARGET VECTOR : NORMAL
EVENT MARK : LARGE
FISH MARK : LARGE
OWN SHIP POS MARK : SMALL
OWN SHIP MARK : ACTUAL
NET SHOOT MARK : SMALL
ESTIMATE ON SCAN : LARGE
ESTIMATE ON ES : 1/8
CURRENT VECTOR : SHORT
RANGE RINGS : 1/4R
SHIP'S TRACK MARK : 5R
MARK SIZE menu
8. OTHERS MENU
Target vector
QUIT
QUIT
QUIT
QUIT
8-9