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The Pelorus is similar in look and application to a compact instrument, a compact instrument or a recpeater, but has no directional characteristics. This means that it stays in any relational sense in which it is located. Usually it is used by adjusting 000° on the lubrication line.
Then, the comparative camps are monitored. These can be transformed into real, magnetical, lattice, etc. bearing. through the addition of the corresponding headline. It is sometimes valuable to use relocating bearing directly. One is useful, for example, when it comes to defining the time when a navigational help is wide on the bar.
This is also useful when pair of relatives are measured, which can be used to measure the range of a navigation tool. When the real course is adjusted at the line of the lubricant, the real bearing is directly monitored. You can also observe the bearing of a bearing when the bearing of the bearing is placed on the line of the control stick, etc.
In order to obtain precise results, however, the ship must be on the course to which it is tuned or the results seen must be corrected. The simplest way to avoid mistakes is perhaps when the helmsman indicates when the ship is on course.
Usually this is done by invoking "mark, mark, mark, Mark, mark" as long as the ship is in a certain part of a grade of the required course. He observes a remote item above the Pelorus and chooses a moment when the ship is calm and on course.
Alternatively, when the gauge's bearings are stable, the watcher pronounces a "mark" and the helmsman notes the course. You should reject the observations if the pointer swings at the time of the observations. If the ship is to the right of the course, the number of degree between the course requested and the real course is added and deducted if the ship is to the south.
So if the course is 060 and the course at the point of viewing is 062°, a 2° adjustment is added to the stock. Its name comes from a Pelorus, who was considered a Hannibal aviator around 203 BC. The points were deduced from fifteen star ascended at approximately equal points in the east skyline.
And they knew the point on the skyline where each of them stood and the times when he did it. However, the real location of these observations corresponds only approximately to their equidistance on the side view pass. In the course of the years, the development of the Pelorus points resulted in the development of the contemporary Compassrose.