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’žA-9 International Description Example Remarks Abbreviation 1. FIXED F A light which appears continuous and steady and of constant colour to an F.W observer whose position remains unchanged in relation to it. 2. OCCULTING A light in which the total duration of light in each period is clearly longer than the total duration of darkness, and the intervals of darkness (eclipses) are usually of equal duration. 2.1. Occulting Oc An occulting light in 2 10 12 which an eclipse is Oc.W.12s regularly repeated. [2] 2.2. Group Occul- Oc(..) ting A light in which a 10 1 1 1 13 number of eclipses Oc(2)W.13s are regularly repea- [1;1;1;10] ted. The total duration of light in each period may be equal to the total duration of darkness. 2.3. Composite Oc (.. + ..) Group Occulting A light similar to a group occulting light, 1 1 1 4 1 4 12 except that succes- Oc(2+1)W.12s sive groups in a [1;1;1;4;1;4] period have different numbers of eclipses. The total duration of light in each period may be equal to the total duration of darkness. 3. ISOPHASE Iso A light in which all 5 5 the durations of light 10 and darkness are Iso. W. 10s clearly equal. M-12 June 2004 A-10 International Description Example Remarks Abbreviation 4. FLASHING A light in which the total duration of light in a period is shorter than the total duration of darkness and the appearances of light (flashes) are usually of equal duration. 1/ The convention is to 4.1. Flashing Fl show the length of a flash A flashing light in to 0.1s 1.5 8.5 2/ When the length of a which a flash is 10s flash is too brief to be regularly repeated at expressed, it is shown as Fl.W.10s a rate of less than 50 Fl and the duration of the [1.5] flashes per minute. eclipse is equal to the period. 4.2. Long Flashing L Fl A flashing light in 3 7 which an appearance 10s of light of not less than 2s duration LFl.W.10s (long flash) is [3] regularly repeated. 4.3. Group Flashing Fl(..) A flashing light in 1.1 1 1 1 10 which a group of 15s flashes, specified in Fl(3)W.15s number, is regularly [1;1;1;1;1;10] repeated. 4.4. Composite Fl(..+..) Group Flashing A light similar to a 1 2 1 6 1 6 group flashing light 17s except that succes- Fl(2+1)W.17s sive groups in a [1;2;1;6;1;6] period have different numbers of flashes. 5. QUICK A light in which flashes are repeated at a rate not less than 50 flashes per minute but less than 80 flashes per minute. 5.1. Quick Q A quick light in which a flash is Q.W regularly repeated M-12 June 2004 A-11 International Description Example Remarks Abbreviation An exceptional light 5.2 Group Quick Q(..) character reserved to 10s A quick light in indicate a South cardinal Q(3)W.10s mark. which a specified group of flashes, 15s specified in number, Q(6)+LFl.W.15s is regularly repeated. 5.3 Interrupted I Q Quick 3 7 10s A quick light in IQ.W.10s which the sequence of flashes is inter- rupted by regular repeated eclipses of constant and long duration. 6. VERY QUICK A light in which flashes are repeated at a rate of not less than 80 flashes per minute but less than 160 flashes per minute. 6.1. Very Quick V Q A very quick light in VQ.W which a flash is regularly repeated An exceptional light 6.2. Group Very character reserved to Quick V Q(..) indicate a South Cardinal 5s mark A very quick light in VQ(3)W.5s which a specified group of flashes, specified in number, 10s is regularly repeated. VQ(6)+LFl.W.10s 6.3. Interrupted Very Quick I V Q 5.1 4.9 A very quick light in 10s which the sequence IVQ.W.10s of flashes is inter- rupted by regularly repeated eclipses of constant and long duration. M-12 June 2004 A-12 International Description Example Remarks Abbreviation 7. ULTRA QUICK A light in which flashes are repeated at a rate of not less than 160 flashes per minute. 7.1. Ultra Quick U Q An ultra quick light UQ.W in which a flash is regularly repeated. 7.2. Interrupted Ultra Quick I U Q 5 7 12s An ultra quick light IUQ.W.12s in which the sequence of flashes is interrupted by eclipses of long duration. 8. MORSE CODE Mo(..) A light in which appearances of light of two clearly 1·3 ·5 ·4 ·5 1·3 6 different durations 10s are grouped to Mo(K)W.10s represent a character [1.3;0.5;0.4;0.5;1.3;6] or characters in the Morse Code. The flashing light may 9. FIXED AND have any of the characters FLASHING F Fl in (4) 5s A fixed light varied, FFl.W.5s at regular intervals, by a flash of higher luminous intensity. An alternating light may 10.ALTERNATING W R W R W R W R W be occulting, isophase, 10s Al A light showing flashing or fixed and Al.WR.10s flashing different colours R w R w alternately. 1 1 1 5 8s Al.Fl(2)RW.8s [1;1;1;5] M-12 June 2004

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