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Navigational TrianglesNavigation triangles are normally used as a pair (one against the other) in order to transfer a directional line to a different place on a chart. In this way, they perform similar to parallel rules. Although some triangles are unmarked, others (such as shown here) have protractors imprinted on them. The protractor can aid in drawing a bearing line directly on the chart, and the 90°angle can be useful in constructing lines of position.


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3-Arm Protractor

$27.00 (4302)
This is the only tool made (other than a computer) that can use three relative bearings to shore objects, and let them be plotted as a fix. Also known as station pointers, their unique capabilities account for ...

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Bi-Rola Rule

$69.00 (6152)
The most exciting new plotter we've seen! A friend of ours reports he was taking a Coast Guard navigation exam with 22 other people. A few of the applicants had the bi-rola rule.

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C-Thru Protactor Triangle

$7.95 (4305)
This is a 90° isosceles protractor triangle with a lifting handle for easy positioning on the chart. The legs are 8 inches long. A sixteenth inch scale is printed on the top edge.

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Charkit Plotter

$112.00 (8999)
A plotting board designed to be used with Chart Kits, and Admiralty and Imray chart books lets you read and plot courses instantly (see descrip­tion of our Chartkit Plotter Arm elsewhere for theory of the pantograph). A clear acryl­ic overlay protects the

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Chartkit Plotter Arm

$46.00 (6116)
Many plotting boards have come and gone. It seems they all have problems. Some are too small; and some are too big ....for YOUR needs. The Chartkit Plotter arm solves this problem by letting you design your own board. The kit consists of the pantograph (s

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Clear Parallel Rules

$7.95 (4306)
Clear parallel rules are made from .186 inch thick plastic for accuracy and strength. The legs are beveled on inner and outer edges, and all metal parts are non-corrosive. Friction pads are fitted to the undersides to...

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Compact Parallel Plotter

$19.00 (4600)
Do parallel plotting in half the space! This plotter mounted on a roller lets you plot courses and parallel lines by simple direct transfer without the space required of traditional parallel rules or triangles.

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Deluxe 9 inch Triangle

$12.50 (4905)
Most protractor triangles are 8 inches on the side. This one has an extra inch. These are very high quality from Blundel Harling in England. Since the triangle is larger the printing is also larger and is in red and green, thus...

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GPS Plotter

$32.00 (130)
Plot GPS positions quickly and easily on your chart! You also can read latitude and longitude of a chart position quickly. It works because the two parallel rules are connected by a patented linkeage which forces the two parallel...

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Graduated Parallel Rules

$19.50 (4603)
Divided with protractor markings (double reading) and compass points. The rules are machined from .155 inch acrylic sheet for accuracy and strength. The legs are beveled on all 4 edges, and the metal parts are made from...

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Lighted Dividers

$29.00 (4206RED)
These innovative new dividers are a variation of the most popular Ultra Light dividers, and are built by the same German manufacturer. A red LED light is built-into each leg for use in low light conditions.

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Linex Course Protractor

$19.95 (4407)
Also known as a one-arm protractor, this is a specialized instrument for plotting courses and bearings. It essentially allows one to orient the base part as a new compass rose at any position on the chart.

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Linex Protractor Triangle

$9.50 (4602)
This is a 90° isosceles protractor triangle with a lifting handle for easy positioning on the chart. The legs are 8 inches long. A millimeter scale is printed on the top edge. It's construction of heavy gauge plastic (.114 inch)

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One Hand Dividers - 7 inch

$22.00 (4204)
These are the most traditional of dividers. Although they are made of brass, the points are of stainless steel to retain sharpness after prolonged use. The design is such that they can be easily opened and closed with...

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One Hand Dividers - 8 inch

$23.00 (4205)
These are the most traditional of dividers. Although they are made of brass, the points are of stainless steel to retain sharpness after prolonged use. The design is such that they can be easily opened and closed with...

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P-72 Course Plotter

$5.95 (4304)
This is a 4 x 15 inch transparent protractor plotter which is very popular with boaters, and the U.S. Power Squadrons. It is printed in two colors, and laminated for protection. The orientation of the protractor makes it particularly...

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Parallel Plotter

$19.00 (4601)
Do parallel plotting in half the space! This plotter mounted on a roller lets you plot courses and parallel lines by simple direct transfer without the space required of traditional parallel rules or triangles.

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Paralock Plotter

$22.00 (90)
Its not often a new plotting tool appears that is worth buying and taking the time to master, but the Paralock promises to be just that. Its locking knob enables the two arms to be fixed in any separation...

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Plotfix

$12.00 (6150)
A relatively new plotting aid that replaces dividers, works faster, and lets you leave your chart folded. Plotfix works on ALL charts, and is especially advantageous on small chart tables.

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Polhemus Celestial Computer

$19.95 (2602)
This unusual device was designed for use in aircraft. It gives arithmetic and vector solutions for speeds of 90 to 2000 knots, with consideration of errors due to acceleration, and a dead reckoning capability of a plotting board.

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Portland Course Plotter

$22.50 (6250)
Previously known as the Breton Plotter, which was an English language version of a popular French small boat navigation plotter. It was originally designed for use be the fishermen of Brittany.

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Sq. Protractor 10-inch

$22.00 (4406)
Also known as a "Douglas" protractor. This protractor/plotter has been around a long time in one form or another. It is best suited for rapid plotting of courses and bearings in a confined space.

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Sq. Protractor 5 inch

$6.00 (4405)
Also known as a "Douglas" protractor. This protractor/plotter has been around a long time in one form or another. It is best suited for rapid plotting of courses and bearings in a confined space.

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Straight Pattern Dividers - 7 inch

$18.00 (4207)
These are the most traditional of dividers. Although they are made of brass, the points are of stainless steel to retain sharpness after prolonged use. The design is such that they can be easily opened and closed with...

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Straight Pattern Dividers - 8 inch

$19.00 (4208)
These are the most traditional of dividers. Although they are made of brass, the points are of stainless steel to retain sharpness after prolonged use. The design is such that they can be easily opened and closed with...

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Triple Parallel Rules

$19.00 (4606)
Twice the reach of regular parallel rules plus they go in any direction (left, right and straight) so you can go directly to the compass rose. There is also less chance for slippage. The rules are 12 inches long. SW 1 lb.

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Ultra-light Dividers

$14.50 (4206)
The most popular dividers today. They look like the older models that are adjusted by turning the wheel between the legs to attain a new setting. You can do that with these too, but the legs themselves can be adjusted by a light...

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Ultra-light Dividers - Spare Leads 2 ea.

$1.00 (4206L)
Spare Leads 2 ea. (Ultra-light Dividers)

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Waterproof Paper

$22.95 (3730)
This waterproof paper can be used with chartmaking software (any electronic charting program in this catalog) to create custom waterproof charts. The paper is synthetic, tear resistant and waterproof.

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Last Updated: March 12, 2010 07:00 pm