Furuno CH-37 - Manual (Page 26)

2-10
2.8 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 posi-
tion on the screen and, combined with the R/B and EVENT
keys, it switches the R/B and event markers on/off. With navi-
gation data input, the event marker moves with ship’s move-
ment.
Function Procedures/Purpose
Trackball
Data
Event
marker
R/B marker
1) Position the trackball marker on the location desired.
1) Position the trackball marker on the location desired.
2) Press the EVENT key to inscribe the event marker.
3) To erase the marker, place the trackball marker outside
the echo display area and press the EVENT key.
Note: CH-37 stores one event marker.
Trackball data
Trackball marker
Event marker
R/B marker
1) Position the trackball marker on the location desired.
2) Press the R/B key. The range and bearing markers
appear and their data appears at the bottom left-hand
side of the screen.
3) To erase the marker, place the marker near the own
ship position or outside the echo display area and
press the R/B key.
2) Read the trackball data displayed at the upper left corner
of the screen.
R/B marker data