Measuring Tools & Sensors

Spare Leads for Ultralight Divider (15-pack) #7291

This kit includes 15 spare compass leads suitable for Weems & Plath dividers (176, 178 & 179). The reusable clear plastic case is a safe and convenient container for lead storage. (Also available in a box of 2 (7231).15 leads per packReusable...

8" One Hand Divider #171

Our traditional 8-inch (20.32 cm) brass one hand dividers can be opened and closed easily with one hand while performing chart work.8-inches (20.32 cm) longBrass handlesTapered sides & polished stainless steel tipsLifetime warrantyWARNING:This...

Weems Parallel Plotter #120

The Weems Parallel Plotter is our most popular rolling plotter. It is mounted on an aluminum roller assembly that allows you to plot courses and parallel lines with simple direct transfer and doesn’t require the space that traditional parallel rules or...

Basic Navigation Set #317

The Basic Navigation Set provides the essential navigation instruments required for basic navigation, such as finding position, range, and bearing to a destination. The set, packaged in a clear, reusable plastic case, includes four tools; the Weems...

Ultralight Divider #176

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, and for good reason. Constructed of coated marine alloy to resist corrosion, these durable dividers are...

15" Value Parallel Rule #145

The 15-inch (38.1 cm) Value Parallel Rule is a basic parallel rule without a protractor scale. Ideal for teaching applications, this clear acrylic & aluminum parallel rule is used to plot a course from a compass rose on a chart.15-inches (38.1 cm)...

15" Brushed Aluminum Arms Parallel Rule #141

Of all our traditional parallel rules, the 15-inch (38.1cm) Brushed Aluminum Arm Parallel Rule is a best-seller. This sturdy acrylic parallel rule includes a protractor scale, is easy to use, and is a necessary tool for every seagoing navigator. The two...

12" Brushed Aluminum Arms Parallel Rule #140

This sturdy 12-inch (30.48cm) parallel rule with brushed aluminum arms is inscribed with a protractor scale. It is used to plot direction on a nautical chart from any convenient meridian or compass rose. The two straight-edged rules are connected to...

18" Aluminum Arms Parallel Rule #138

The 18-inch (45.72cm) Aluminum Arms Parallel Rule feature aluminum arms that join two clear acrylic rulers inscribed with a protractor scale. An essential item in any proper navigation kit, these rules are used to plot direction on a nautical chart from...

Nautical Slide Rule #105

The Nautical Slide Rule offers a foolproof, immediate solution to all common speed/time/distance problems and is convertible to statute or nautical miles. It also allows the user to compute distance in yards if the speed is factored in knots. The...

Professional Protractor Triangle #104

The Professional Protractor Triangle with handle is larger than other navigation triangles on the market, with sides that are 9-1/4 inches (23.50cm) long and a hypotenuse (long side) 13-inches (33.02cm) long.Its clean, uncluttered design is inscribed...

Protractor Triangle without Handle #103

Often used in a combination of two, our Protractor Triangle provides a straightforward method of plotting and performing chart work. Each triangle is inscribed with black markings. The protractor scale on the triangle can aid in drawing a bearing line on...