Furuno FR-8122 EU - Manual (Page 29)

1. OPERATIONAL OVERVIEW
1-18
1.16 Measuring the Range to a Target
The range to a target may be measured three ways: with the fixed range rings, with the cursor (if
set to measure range and bearing), and with the VRM.
Use the fixed range rings to obtain a rough estimate of the range to a target. They are the concen-
tric solid circles about own ship, or the sweep origin. The number of rings is automatically deter-
mined by the selected range scale and their interval is displayed at the upper-left position of the
screen. Count the number of rings between the center of the display and the target. Check the
range ring interval and judge the distance of the echo from the inner edge of the nearest ring.
1.16.1 Adjusting range ring brilliance
1. Press the MENU key to open the menu.
2. Choose the Brill/Color menu and press the ENTER key.
3. Choose Range Rings Brill and press the ENTER key.
4. Choose appropriate brilliance and press the ENTER key.
5. Press the MENU key to close the menu.
Brill/Color
Echo
Mark
Target Trails
Custom 1
Display
Custom 2
Custom 3
GPS Buoy
Target
ARP
AIS
GPS
System
Tuning
Display Color
Background Color
Range Rings Brill
Echo Color
:Black/Green
:Night
:High
Menu Brill/Color Brill/Color
[ENTER]: Enter [CANCEL/HL OFF]: Back
[MENU]: Exit
:Yellow
Off
Low
Med
High