Koden RA40C, Инструкция по эксплуатации

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VRM (Variable Range Marker)
This is a circular-shaped marker whose size can be changed as desired. You can use
this marker when you want to examine the distance of an echo from your ship.
When measuring the distance of an echo from your ship, be sure to measure at a
point close to the center of the echo image on the screen.
EBL (Electronic Bearing Line)
This is a marker shaped like a straight line segment that can be changed to any direc-
tion centering around the ship position. Use this marker to examine the advancing direc-
tion of your ship and its relative angle with an echo. When measuring the angle of an echo,
position the marker at the center of the echo.
VRM
Echo
0.75
0.25
HU
VRM
Fig.2-11 VRM
0.75
0.25
HU
EBL
Echo
EBL
Equal intervals
Fig.2-12 EBL