Blundell Harling NATO Speed-Time-Distance Calculator hydrographic department It's designed to give you

It's designed to give you a smooth and precise operation with reliable accuracy

Sanda Island (1:30

with Chris featuring as a history expert on TV and radio

This second edition features revised and expanded content

000 24 Apr 2025 5606_8 Southend-on-Sea to Canvey Island 1 : 25

Blundell Harling NATO Speed-Time-Distance Calculator hydrographic department It's designed to give youThe Blundell Harling Speed Time Distance Slide Rule is a practical navigation tool designed to simplify essential maritime calculations. By inputting any two variablesspeed, time, or distanceyou can quickly determine the third, facilitating efficient voyage planning and real time decision making. Crafted with a high impact plastic outer sleeve, this slide rule ensures durability and longevity, even in demanding marine environments. Its compact size