Cannon operation
The cannon can be aimed at a target using 3 methods. These methods follows the target acquisition systems:
HMS  EOS  RADAR 
Note the gun trail, which is heading in the direction of the aim of the current selected system.
Contents 
Proper lasing
Gravitational force do apply to cannon bullets, i.e. bullets will fall short at longer distances. To compensate for the amount of bullet drop the cannon has to alter its aim (somewhat higher). Hereby the value of distance is most important to have. There are 3 ways to gain a distance value over a target.
method  accuracy 


highly inaccurate 

accurate 

very accurate 
The first method used by the helicopter is triangulation. Hereby it gauges the angle, and obtain a distance by calculations. When selecting RADAR the distance value is more accurate, but it only updates once every radar sweep. LASER can measure the distance so precise it can give the absolute value in meters towards the target. This is often necessary for engagement with cannon rounds.
Example
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Method notification
On the HUD and the RADAR, EO and weapon MFD pages is a notification on what method is currently in use.triangulation  RADAR  LASER 