2PCS Chart Drawing Triangle Ruler For Ship Drawing 300mm Large-Scale Triangle Ruler High Quality For Distance Measurement Teaching Engineering Design Ship Nautical Protractor Positioning

Inscribed with contrast-enhancing colors (black & red), black handle with pencil holder for easy maneuverability.

Used as a pair to transfer a directional line on a chart, protractor scale allows easy alignment with chart meridian in any direction.

Direction is maintained as one triangle is slid along the other to desired position, 90 degree angle helps determine lines of position.

Determine longitude on protractor to determine course or bearing.

The protractor's vertex allows placing a dividing point or pencil on a point of the hole.

A string can be used to fix the stopwatch used on the hole for a long distance of course.

When charting, it is used to draw the bearing line or heading line, and measure the bearing line or heading degree.

Advantages:

The ruler scale is clear, can be used alone or two together, more convenient and flexible than parallel ruler, in the measurement of the azimuth line or course line degree, but with the chart of the compass flower distance, the use of nautical triangle to measure the azimuth line or course line degree is more convenient.

Description:

Nautical triangle is one of the commonly used chart tools and instruments on ocean ships, its accuracy will affect many aspects, and the choice of good quality nautical triangle is conducive to accurate navigation.

The ship is equipped with two nautical triangles of the same specification. Depending on the situation, it can be used alone or in combination.

In the application, the navigation triangle is more convenient and flexible than the parallel ruler. Especially when the degree of azimuth or course is measured, but it is far away from the compass flower on the chart, it is more convenient to use the nautical triangle to measure the degree of azimuth or course.

In specific operation, the long side of one triangle is aligned with the azimuth line or course line to be measured, and then with the other triangle, the long side of the azimuth line or course line is moved parallel to the nearest longitude line, so that the center point of the arc coincides with the longitude line, and finally the azimuth or course degree is read from the arc scale. In this case, the use of parallel ruler, it is necessary to move a long distance in parallel to the compass flower, the operation is careless, the static ruler is easy to shift and produce errors.

Function: It is used to draw azimuth line or heading line and measure the degree of azimuth line or heading line when charting.

Note:

1. Due to manual measurement, please allow an error of 0-3mm, thank you.