Section 4 Range and Bearing Measurement Methods  4-14 
4.6.2.2  Displaying parallel index lines by using the [PI] key on 
the operation unit 
1 
Press the [PI] key. 
 
Operation when the [PI] key is pressed: 
•  When the [Display for All Lines] button is set to Off, PI is set to On and the [PI Menu] dialogue 
box is displayed. 
•  When the [Display for All Lines] button is set to On and the [PI Menu] dialogue is displayed, 
the [PI Menu] dialogue is closed. PI remains On. 
•  When the [Display for All Lines]  button is set to On and the [PI Menu] dialogue  is not 
displayed, PI is set to Off. 
2  Set PI on the [PI Menu] dialogue. 
For the [PI Menu] dialogue, refer to "4.6.2.3 Description of the [PI Menu] dialogue". 
The  [PI Menu] dialogue  setting method varies according to the PI operation mode. For the 
details, refer to the description of each operation mode, "4.6.3 Setting all the parallel index lines 
concurrently (All mode)", "4.6.4 Setting parallel index lines individually (Individual mode)", "4.6.5 
Displaying lines at equal interval on the left and right sides of the own ship’s position (Track 
mode)", and "4.6.6 Displaying two intersecting lines (Equiangular mode)". 
 
4.6.2.3  Description of the [PI Menu] dialogue 
 
Parallel index lines can be operated by using the EBL/VRM dial of the keyboard operation unit only 
while the [PI Menu] dialogue is displayed. Even if the dialogue is closed, the parallel index lines 
remain displayed, however, the bearing and interval cannot be operated.   
To reset the bearing and the interval, set by redisplaying the [PI Menu] dialogue. 
 
The following items can be set on the [PI Menu] dialogue. 
Lines 
Use this button to switch display for all parallel index lines to ON/OFF. 
The button ON/OFF state is maintained even if the dialogue box is closed.   
The parallel index lines to be displayed are those that have been selected by 
operating [View] - [Tools] - [PI] on the menu. 
When the operation mode is [Individual], the parallel index lines that were selected 
by operating [View] - [Tools] - [PI] (Index Line 1 to Index Line 8) are displayed on the 
screen. 
When the operation mode is [Track] or [Equiangular], the parallel index lines that 
were selected by operating [View] - [Tools] - [PI] (Index Line 1, Index Line 3, Index 
Line 5, and Index Line 7 correspond to Groups 1, 2, 3, and 4 respectively) are 
displayed. 
When the operation mode is All, the line at the centre of the screen becomes Index 
Line 1 and the parallel index lines from the centre to the outer section correspond to 
Index Line 2, 3 and so on. 
Select an operation mode from among [All], [Individual], [Track], and [Equiangular]. 
When any operation mode is selected, the dialogue box of the selected operation