Position Finding by the Improved Sumner" Method: Contrasted With the New ..."

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Navigating the high seas can be a daunting task, but with the help of the improved Sumner method, finding your position on the ocean is easier than ever. In this informative guide, author Harold S. Blackburne provides a step-by-step explanation of this innovative navigation technique, along with helpful tips and case studies to illustrate its effectiveness.