Battery-free precision for safe navigation

Measure distances with the WNDSN Quadrant Telemeter (WQTM): a compact, laser-engraved instrument for adventurers, surveyors, instructors, and anyone who values a reliable, non-electronic rangefinder. The WQTM is made of rugged, corrosion-resistant white acrylic with clearly readable, high-contrast scales. It provides repeatable angle measurements for determining distances to objects of known height; without batteries or apps.

Reliable, precise, robust, self-sufficient

Why you need it

• Reliable data: Works even if the electronics fail - no batteries, no signal, no surprises.
• Precision made easy: Laser-engraved Quadrant and measuring lines make it easy to measure angles and convert them to distances.
• Marine-grade construction: Acrylic and corrosion-free materials withstand sun and salt water; compact enough for a navigation cabinet or survival kit.
• Elegant and educational: Clean, modern design that's suitable both as a teaching aid and as an attractive desk object.

As seen at Spartanat

The Pocket Quadrant Telemeter from WNDSN is a true multifunctional calculator. If you have it with you, you can calculate sizes and distances relatively easily, or even determine the time, using the position of the sun. It takes some practice to master all of its functions, but estimating distances is quick and easy without any other tools. A daily companion for anyone who enjoys measuring the world.

Scope of delivery

• WNDSN Quadrant Telemeter (white acrylic)
• Quick guide with step-by-step examples
• Cardboard protective cover
• String
• Plumb weight

How it works

Sight either the top and bottom edges of an object with a known height with the Telemeter, or just the top edge with the Quadrant, read the angle on the engraved scale, and calculate the distance using the nomogram -- a simple trigonometric method that becomes quick and easy with a little practice.

Perfect for

• Recreational sailors, coastal cruisers, and day boaters seeking reliable navigational support.
• Sailing instructors and navigators teaching classic techniques.
• Hikers, guides, and preppers seeking compact, battery-free tools.
• Gift shoppers looking for a beautiful, functional keepsake.

See it in action

Watch our short demo for quick targeting tips and practical examples.

Satisfaction & Support

We offer a quick start guide and our satisfaction guarantee. Contact us for training materials, lesson packages, or measurement examples.

Expand your navigation kit with a reliable and attractive backup -- a small tool that will give you peace of mind on every journey.