4-7  Section 4 Range and Bearing Measurement Methods 
 
 
 
APP A 
APP B 
 
4.4  Using the Range Rings 
Range rings are multiple concentric circles displayed on the PPI screen. 
Using range rings on the PPI screen, the range to a target can be measured by determining at which 
scale interval the target is positioned. 
 
The display of range rings can be turned on/off according to the following procedure. 
1  Click the Rings button in Range and mode information. 
 
 
 
Each time this button is clicked on, display switches between On and Off. 
On: 
 
Off: 
 
 
Memo 
By using the dialogue  that is displayed by clicking on [View]  - [Tools] on the menu, the 
display can be switched to On/Off. 
The colour and brilliance of Range Rings can be set. For the detais, refer to "11.1.11 Setting 
up the Display of Range/Bearing Measurement Function".