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Bow Dividers 175mm by Blundell Harling nautical chart – Boat Books | Mapworld

Bow Dividers 175mm by Blundell Harling

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Bow Dividers 175 mm — Blundell Harling

Solid Brass Single-Handed Divider • Traditional Chartwork Tool

The Blundell Harling Bow Dividers 175 mm are a classic navigator’s instrument, purpose-built for accurate chart plotting and distance measurement. Traditionally styled and crafted with a solid brass body and stainless steel points, these dividers deliver dependable precision with the tactile confidence of a time-tested design.

Ideal for nautical charts, pilotage work, and seamanship training, the single-handed “bow” mechanism allows smooth, controlled adjustments—perfect for frequent use at the chart table.


🧭 Key Features

  • 📏 175 mm (7″) span — a practical size for most nautical charts

  • ✨ Solid brass construction — durable, corrosion-resistant, and classic in appearance

  • 🛠️ Stainless steel points — sharp, hard-wearing tips for precise marking

  • 🤲 Single-handed bow design — quick, accurate adjustment with one hand

  • ⚓ Traditionally styled — mirrors the tools used by generations of navigators

  • 📦 Supplied in a blister pack — protected and ready for use


⚓ Built for Accurate Chartwork

Brass has long been the material of choice for navigation instruments thanks to its strength and resistance to marine environments. Paired with stainless steel points, these dividers maintain accuracy over time—whether measuring distances, stepping off courses, or transferring positions between chart features.

The bow-style adjustment offers finer control than simple hinged dividers, making it especially useful for repetitive plotting and instructional use.


📐 Specifications

Specification Details
Length 175 mm (7″)
Body Material Solid brass
Points Stainless steel
Adjustment Single-handed bow mechanism
Packaging Blister pack

🎯 Ideal For

  • ⛵ Sailors & offshore cruisers

  • 🧭 Navigation students & instructors

  • 📚 Chart plotting & passage planning

  • 🎁 Traditional nautical tool kits


The Blundell Harling Bow Dividers 175 mm are a reliable, traditional choice—accurate in use, durable in construction, and timeless in style.

Add a classic chartwork essential to your navigation kit and plot with confidence.


Frequently Asked Questions

What is the Bow Dividers 175mm by Blundell Harling used for?

This chart plotting instrument is used in marine and aerial navigation for measuring distances, plotting positions, and calculating bearings on nautical and aeronautical charts. It is an essential tool for accurate manual chart work.

Is this instrument compatible with standard nautical charts?

Yes, this instrument is designed for use with standard nautical charts. Check that the scale markings correspond to the chart scale you are working with for accurate measurements and bearings.

Is this instrument suitable for recreational or professional use?

Chart plotting instruments from Mapworld suit both recreational sailors and professional navigators. They are accurate, durable tools built for regular chart work in marine and aviation navigation.

Does Mapworld ship the Bow Dividers 175mm by Blundell Harling across Australia?

Yes, Mapworld ships Australia-wide. Standard shipping is a flat $7 rate, with free standard shipping on orders over $75. Express options are available at checkout. Most orders placed before 2pm AEST on business days are dispatched the same day.



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