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HORIZONTAL SEXTANT ANGLE

01 (a) A vessel at anchor off Foreland Point observes the following:

• Foreland Point Lt. (51° 15’N 003° 47’W) – 190° (G)
• Nash Point Lt. (51° 24’N 003° 33’W) – 070° (G)
• Scar weather Point Lt. vsl. (51°27’N 003°56’W) – 320° (G)

Find the vessel’s position and the Gyro error.

(b) From the above position,

set Gyro course so as to have Helwick Lt. Vsl. (51°31’N 004° 25’W) right ahead when 6 miles off with current setting East at 3 knots. Find the steaming time when Helwick Lt. Vsl. will be right ahead? (Use 12 knots engine speed).

Answer :

HSA Btw Foreland Point Lt. & Nash Point Lt. – 120° / Complimentary Angle – 030° HAS Btw Nash Point Lt. & Scar Weather point Lt. vsl – 110° / Complimentary Angle – 020°

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