# PDU-4

Introduced in **0.2.414**

PDU-4 is a Russian binocular rangefinder with day optics with a 360° digital compass and a laser rangefinder. It provides distance measurements up to 9 km with 7x magnification.

The engraved reticle has a long line spacing of 10 mils and short line spacing of 5 mils. 1 mil corresponds to 1 m spacing at a distance of 1 km. In the image below you can see a 1 m cube being sighted at 100 m being exactly 10 mils.

Due to unavailability of documentation, the functionality of the PDi in game is identical to that of Vector-21. We suspect that in real life it is also close.

While looking through the binocular view you can perform the following actions:

Keys | Description | Examples |
---|---|---|

Press and hold | Measures distance in meters to target. | |

Press and hold | Measures azimuth in degrees to target. | |

Press and hold | Measures distance in meters and azimuth in degrees to target. | |

Press and hold | Measure distance between 2 points. | |

Tap | Measure horizontal and vertical distance between 2 points. The vertical distance is shown in the range indicator on the left. The horizontal distance in the azimuth indicator at the top. | |

Tap | Measure azimuth and inclination to a point. Inclination, in degrees, is shown in the range indicator on the left. | |

Tap | Measure horizontal and vertical distance to a point. The vertical distance is indicated in the range indicator on the left. | |

Press and hold | Measure distance and azimuth between two points. | |

Tap | Measure fall of shot between target and arty impact for correction. |

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