What is a parallel navigation?
Parallel navigation describes the fact that as the two boats approach each other on a collision course, the line-of-sight does not rotate relative to the external world (here represented as North). This means that the bearing angle γ, formed between north and the LoS does not change over time.
Does a ruler have parallel lines?
When you move the ruler, you have parallel lines. You can label them, identifying each line with two named points and placing arrowheads at the end of the two lines. Now, you have two intersecting lines.
What is the use of parallel indexing?
Parallel indexing is a technique used as a measure to monitor the progress of a vessel on the track and to minimise the cross track distance and to keep vessel at a safe distance from the shoreline or rock.
How do you use a parallel ruler?
How to use parallel rulers Parallel rulers are used to plot direction on your nautical chart. They are, essentially, two straight-edges hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non-moving edge, you can move the rulers about the chart while still maintaining the same angle.
Do you need a parallel ruler in a nav station?
Parallel rulers and plotter are, of course, rulers in their own right, but we have enough need for longer lines and other special applications to justify having a separate ruler in the nav station. Same with the protractor. What tools are needed for specific courses?
How do you use a parallel line tool?
This is a tool that lets you draw one line parallel to another, some distance away from it. To use it, align one edge of the rulers with the base line, and then holding down that side of the tool, move the other side to the location of the new line.
How do you use a ruler to find the direction?
By alternating the moving edge, and securely holding down the non-moving edge, you can move the rulers about the chart while still maintaining the same angle. To determine the direction between two positions or points on a chart, line up the rulers with the two points and then step the rulers to the nearest compass rose.