Measuring Range And Bearing - Simrad R2009 User Manual

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• press the rotary knob to switch between adjusting EBL and VRM
Offsetting the EBL/VRM marker
1. Press the EBL/VRM softkey twice to display the pop-up
2. Select the Set offset option
- The pop-up closes, and the cursor is positioned in the EBL/VRM center
3. Use the arrow keys to move the EBL/VRM center, then select one of the following options:
- press the ENT key to fix the marker to the selected position, then use the arrow keys to
move the EBL/VRM intersection
- turn the rotary knob to adjust the EBL
- press the rotary knob to toggle between EBL and VRM, then turn the rotary knob or use
the arrow keys to adjust the item that is editable
You remove the EBL/VRM marker from the radar image by pressing the EXIT key.

Measuring range and bearing

Different options are available for measuring the position, speed, course, distance and
bearing of radar echoes.
• Cursor position
• Range rings and bearing scale
• EBL (Electronic Bearing Lines) and VRM (Variable Range Markers)
It is important to minimize the range to obtain the best precision for the measurement. In
most cases you can use a higher range if you position the PPI in one of the off-center modes.
Refer "Offsetting the PPI center" on page 22.
Note:
Every measurement made with cursor or EBL/VRM is always referred to the
Consistent Common Reference Point (CCRP).
Using the cursor
When you position the cursor over an echo, the cursor information area will show range and
bearing from the vessel to the cursor position.
This measuring option gives a fast and precise measurement of distance to a target.
Range rings and bearing scale
Range rings and bearing scale is used to measure distance when a fast measurement is
required. This measuring option gives only an approximate distance and speed of a target.
The range scale (A) and the distance between two adjacent range rings (B) are shown in the
System Information are on the radar image.
The range scales, the related distance between the range rings and number of rings are:
Range (NM)
1/8
1/4
1/2
3/4
1.5
3
6
12
24
36
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Distance between the
range rings (NM)
1/40
1/20
1/10
1/4
1/4
1/2
1
2
4
6
8
Number of range rings
5
5
5
3
6
6
6
6
6
6
6