Furuno CH-37BB, Operator'S Manual

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2. SONAR MODE
2-6
2.6 R/B and Event Markers (trackball operation)
The trackball functions to obtain the data (slant & horizontal range, depth and bearing)
from own ship to the specified position on the screen and, combined with the R/B and
EVENT keys, it switches the R/B and event markers on/off. With navigation data input,
the event marker moves with ship’s movement.
Function Procedure/Purpose
Trackball
data 1) Position the trackball
marker on the location
desired.
2) Read the trackball
data displayed at the
upper left corner of the
screen.
Event
marker 1) Position the trackball
marker on the location
desired.
2) Press the EVENT
key to inscribe the
event marker.
R/B marker 1) Position the trackball
marker on the location
desire.
2) Press the R/B key.
The range appears at
the bottom left corner of
the screen.
Erase
marker 1) Place the marker out-
side the echo display
area.
2) Press the EVENT or
R/B key.
Trackball marker
Trackball data
→: Horizontal distance
→
: Straight distance
→
: Depth
B: Bearing
Echo display area
Trackball marker
Bearing marker
Range marker
R/B marker data
→: Horizontal distance
: Straight distance
↓ : Depth
B: Bearing
Bearing marker
Range marker
Trackball marker