Blundell Harling NATO Speed-Time-Distance Calculator hydrographic department This straightforward guide is designed

This straightforward guide is designed to take the novice step-by-step through the stages of designing both power and sailing boats

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

– Sandy Duker

Choosing the right boat

Sanda Island (1:30

Blundell Harling NATO Speed-Time-Distance Calculator hydrographic department This straightforward guide is designedThe 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