The Bi-rola Rule is a rugged plotter that is used by professional navigators because it is quick & easy to use. The patented vertical & horizontal rolling motion simplifies course & plotting calculations.
- Adjustable radial arm allows automatic compass corrections in course plotting- Roller body with protractor markings & nautical mile scale- Radial arm has Loran interpolator scales & 200 millimeter rule- When radial arm & body are used jointly, the Bi-Rola becomes a 17 inch divider- Speed/ time/ distance table included- Easy to follow instructions on back of protective, durable vinyl pouch- Lifetime warranty
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The Weems Parallel Plotter is our most popular rolling plotter. It is mounted on an aluminum roller assembly that means that you can plot courses & parallel lines with simple direct transfer & doesn’t require the space that traditional parallel rules or triangles need. The roller keeps the plotter parallel as you slide it across the chart. It

Includes:: distance scales at 1:20, 000, 1:40, 000 & 1:80, 000 to fit U.S. Coast & Harbor Charts, as well as an inch scale. A semi-circular protractor for measuring course & bearing against meridian on a chart & two quarter circle protractors for measuring course & bearing against parallel of latitude are built into the plotter. It is also used for measuring or laying off courses & distances on a nautical chart.- 12-1/2 inches (31.75cm) long
- Durable acrylic plotter mounted on marine aluminum roller assembly-

Includes:: distance scales at 1:20, 000, 1:40, 000 & 1:80, 000 to fit U.S. Coast & Harbor Charts- Inch scale- Semi-circular protractor- Two quarter circle protractors- Instructions on back of plastic storage sleeve- Lifetime warranty




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This compact GPS parallel rule is well-suited for use on small chart tables. The primary purpose of the Para Lock Plotter is to enable the transfer of GPS positions rapidly, easily, & accurately to & from any paper chart. This unique plotter features three unique design concepts: 1) The black locking knob is friction adjustable for fast lat/long transfers. It enables the two rulers to be fixed in any given separation, which allows rapid determination of GPS position. 2) Two sets of finger holes enable finger tips to act as friction pads on the underlying chart & inform the navigator if the rule has slipped while plotting. 3) The Para Lock Plotter is only 7.25 inches (18.42cm) long, as opposed to the standard rule length of 15 inches (38.1cm), but its opening width is the same as standard rules.
- 7-1/2 inches (19.05cm) long- Sturdy, clear acrylic for maximum chart visibility- Locking knob- Finger holes
- Graduations for use as protractor to determine compass bearing- Ruler across bottom to transfer distances to mileage scale- Fits in a pocket or drawer- Plastic Storage sleeve with instructions on back- Lifetime warranty

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Often used in a combination of two, our Protractor Triangle with Handle provides a straightforward method of plotting & performing chart work. Each triangle is inscribed with contrast enhancing colors (red & black), plus a handle that holds a pencil, making it convenient & easy to use. The protractor scale on the triangle can aid in drawing a bearing line on a chart, & the 90° angle is helpful when determining lines of position. When used in pairs, the second triangle acts as an extension, & the pair together are a reliable means to transfer a directional line on a chart with no slippage.- 19.69 cm x 27.94 cm hypotenuse- 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- Made from clear durable vinylite- Lifetime warranty
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The ROADrule CEVNI is a quick reference tool that identifies navigation aids & markers as prescribed by the European Code for Inland Waterways. It takes a large amount of complex information & makes it easy to understand using a sliderule design with a magnifying lens.- Identifies navigation aids & markers as prescribed by the European Code for
- Inland Waterways- Displays 38 Navigation Aid Definitions- Displays 12 Rules of the Road- Magnifying lens for clear readability of definitions- Durable plastic construction- Lifetime warranty
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Our Ultralight Dividers are the perfect tools to fill out your navigation kit. They are the best-selling navigation tool in our whole product line, & for good reason. Constructed of coated marine alloy to resist corrosion, these durable dividers are fully adjustable & easy to use. They feature a unique center adjustment mechanism that allows quick, precise one-hand operation. Both tips can be interchanged with stainless steel points or pencil leads to turn the divider into a compass.
- 7-inches (17.78 cm) long- Coated marine alloy & plastic to resist corrosion- Center gear mechanism for easy use- Spare point, knob & lead provided- Made in Germany- Lifetime warranty
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With the aid of a Vectormaster, you may quickly determine a course that will put maximum distance between your vessel & an oncoming storm, given the position of a storm & direction & speed of its advance. This circular slide rule can be used to determine the solution of time, speed & distance, & fuel consumption. It can also be used for conversions, multiplication, & division. Turning the dial on the face of the Vectormaster permits rapid solution of problems involving vectors, such as those encountered in current sailing, determination of true wind direction & force, & apparent wind to be expected on other headings.
- Two-sided circular slide rule- Sturdy PVC construction- Instructions on backside- Lifetime warranty
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Inspector Albertus Beeslaar is a traumatized cop who has abandoned tough city policing & a broken relationship in Johannesburg for a backwater post on the edge of the Kalahari Desert. But his dream of rural peace is soon shattered by the repeated attacks of a brutally efficient crime syndicate, as he struggles to train & connect with rookie local cops, Ghaap & Pyl, who resent his brusqueness & his old-school ways. ...

This antique style wall clock features Roman numerals & a clear monochrome face so it is easy to read from afar. With three additional smaller dials, this clock also indicates barometric pressure with weather forecast symbols, thermometer & humidity. The antique rust effect adds an additional aesthetic finish to this traditional design. Requires one AA battery, not included. ...

Weiden i.d.OPf. in a series of GPS compatible recreational editions of the Bavarian topographic survey at 1:25, 000, with waymarked hiking trails & cycling routes, campsites & youth hostels, etc. Coverage

Includes:: Vohenstrauß, Leuchtenberg, Luhe-Wildenau, Waldthurn, Wernberg-Köblitz. Contours used in this map vary between 5 to 20m according to the terrain, with 20m interval predominantly used for hilly areas. Varied colouring show different types of landscape: woods, vineyards, fields etc. Maps in this series feature extensive overprint highlighting local & long-distance footpaths & cycle routes, including King Ludwig Way or different variants of the Way of St James, indicating their waymarking. Symbols highlight different types of accommodation (campsites, youth hostels, refuges, etc), sport & recreational facilities, various places of interest, etc. The maps have a 1-km UTM grid. Map legend & all the text are in German only. To see other titles in this series please click on the series link.

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