Group-Flashing Light

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2-5-155

Flashing light in which the flashes are combined in groups, each group including the same number of flashes, and in which the groups are repeated at regular intervals. The eclipses separating the flashes within each group are of equal duration and this duration is clearly shorter than the duration of the eclipse between two successive groups. (Fig. 40c)

Ch2 Fig40.jpg

Reference: N.L.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

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Julian date

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Level (technician training - WWA)

Latitude (in degrees)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM