Raymarine C140w - Manual (Page 121)

9.10 Using radar to measure distances,
ranges, and bearings
When you are using the radar application, you can measure
distances, ranges and bearings in a variety of ways.
These options are detailed in the table below:
Functions
Distances
Between
Points
Range From
Your Vessel
Bearings
Range Rings Yes
(approximate
distance) Yes
(approximate
range) No
Cursor No Yes Yes
Variable Range
Markers (VRMs) No Yes No
Electronic
Bearing Lines
(EBLs) No No Yes
Floating VRMs Yes No No
Floating EBLs No No Yes
Measuring using the range rings
Use the range rings to gauge the approximate distances between
points. Range rings are concentric circles displayed on the screen
and centred from your boat at pre-set distances. The number and
spacing of the rings changes as you range in and out.
Range - 1 /
4
nm
Range rings - 1 / 8 nm apart
Range - 3 /
4
nm
Range rings - 1 / 4 nm apart
Range - 1 1 /
2
nm
Range rings - 1 / 4 nm apart
D8407_1
e .g.
Measuring using the cursor
To measure the bearing and range from your boat to a specified
target, move the cursor to the appropriate position on the screen.
Bearing and range from
your vessel to cursor
D8402_1
Cursor
Note: If cursor position is not shown in the Databar, go to Menu
> Databar Setup > Configure.
Measuring using Variable Range Markers (VRMs)
A Variable Range Marker (VRM) is a circle centred on your vessel’s
position and fixed with respect to the heading mode. When this
circle is adjusted to align with a target, its range from your boat is
measured and displayed on the ADJUST VRM softkey. The data is
also displayed if you select the VRM with the cursor.
Using radar 121