The Blundell Harling 8″ Portland Single Handed Brass Divider is a classic, traditionally designed marine navigation instrument used to measure distances and calculate transit times on paper charts. It features a unique “bow” or “crossover” handle design, enabling a navigator to open, close, and adjust the spacing of the points seamlessly with only one hand while leaving the other free to manipulate a parallel rule or write logs.
Key Features
- Single-Handed Bow Ergonomics: The distinctive curved top section crosses over, allowing you to use your thumb and fingers to effortlessly expand or squeeze the legs together with a single hand.
- Solid Brass Body: Crafted with high-grade solid brass legs that provide a heavy, balanced feel and offer strong resistance against harsh, salty marine environments.
- Stainless Steel Tips: Fitted with sharp, precision-ground stainless steel points that accurately pin coordinates without bending, wearing down, or ripping the paper chart.
- Ashore and Afloat Utility: Highly relied upon by professional commercial sailors, blue-water cruisers, and maritime students undergoing yachtmaster charting qualifications.
Product Specifications
- Brand: Blundell Harling (Portland Range)
- Manufacturer Part Number: 0654.14B
- Length: 8 inches (approx. 200 mm)
- Leg Material: Polished Solid Brass
- Points Material: Stainless Steel
How to Use for Distance Calculation
- Setting the Step: Look at the latitude scale on the left or right edge of your nautical chart. Set the tips of your divider to span a specific distance milestone—for example, exactly 1 nautical mile or 5 nautical miles (remembering that 1 minute of latitude equals 1 nautical mile).
- Stepping the Track: Place one tip at your departure waypoint along your plotted course line. Pivot the tool forward on its tip, stepping the trailing tip down further along the trackline.
- Summing Distance: Count the number of full steps required to cover your route. Multiply the number of steps by your preset scale value to get the total distance in nautical miles.
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