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This all-in-one double sided slide rule, used for day and night vessel identification shows aspect for the vessel, (port, stbd, fwd and astern), (60) position of lights and/or (15) day/fog signals, full magnified description for all manner of maritime vessels displayed for each situation.
Size 417 x 133 mm.
A simple compact but detailed self-tutor. A MUST for every Officer studying for STCW certificates.