# Coupling location

Coupling location (O k ) is a navigation term . According to DIN 13312, it refers to a location of the vehicle determined from a known location by drawing or calculation, taking into account all foreseeable influences (including electricity for seafaring). An outdated name for a coupling location is Gegisster Ort (von Gissen ).

## Example of seafaring

A ship is at the position 50 ° 10 N, 001 ° 00 W at 12:00 noon. The ship is planned to sail east (90 °) for half an hour.

In order to calculate the O k 1230, the following information must be available:

• Stream Velocity (BS). Is there a current? If so, how much and from which direction (e.g. 180 °, 2  kn )?
• Wind offset (BW). Is there a possibility that the ship will drift away from the wind? If so, in which direction and how much (e.g. BW -2 °)?
• Speed ​​of the ship. How fast will the ship travel through the water (e.g. 12 knots)?

## Notation

The coupling location is written as follows:

O k 1230: 50 ° 10.2 N, 000 ° 50.8 W.

## Use

In terrestrial navigation, the determination of the O k is often the only way to determine one's own position if no other method for determining position such as e.g. B. satellite navigation systems , landmarks or astronomical navigation are available. Therefore, it is important to check the O k with observed locations as often as possible and determine the cutlery offset .