Raymarine RL70C, Owner'S Handbook Manual

Page: 66 / 218

52 HSB Series LCD Display
3.2 Range Control
The radar picture can be viewed at various scales. The shortest range scale gives
a maximum range of
1
/
8
nautical miles, measured from the default centre to the
top of the radar picture. The longest range scale gives a maximum range of
between 24 and 72 nautical miles depending on your scanner.
• The long range scales provide the best overview of your vessel’s relationship
to land masses, weather fronts and large ship targets in or beyond view.
• The short range scales provide greater detail of the radar echoes close to your
vessel, and should be used as you approach the coastline, harbour or other
vessels in the area.
The Pathfinder Radar display includes concentric range rings, which you can
use to help you to judge distances on the radar picture. Their number and
spacing are adjusted automatically if you change the range scale. They can be
turned off if required (see
Section 2.3 ).
Changing the Range
RANGE
D3939_1
Increases
the range scale
Decreases
the range scale
Selected
range scale Range ring
spacing
Status Bar
6nm
RR
1nm
343°T
➤
Each time you press the
RANGE
key, the range changes to the next available
setting. The system will beep three times if no further range scale is available.
➤
To change the range quickly, press and hold the required arrow on the RANGE
key.
The range scale and range ring interval indicators, at the left-hand end of the
status bar, are updated whenever you change the range.
The Standard Range Scale
Details of the standard ranges that can be selected are shown in the table below.
If you wish, you can customise the range scales by specifying different ranges,
as described in
Chapter 7 .
Range
Control