Canadian Chart 1 Symbols, Abbreviations and Terms
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Lights - Section P
Light Characters
| Ref. | Abbreviation | Class of light | Illustration | |
| IHO Symbology | IHO Symbology | |||
| 10.1 |  |
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Fixed |  |
| 10.2 | Occulting (total duration of light longer than total duration of darkness) | |||
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Single-occulting |  |
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Group-occulting |  |
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Composite group-occulting |  |
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| 10.3 | Isophase (duration of light and darkness equal) | |||
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Isophase |  |
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| 10.4 | Flashing (total duration of light shorter than total duration of darkness) | |||
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Single-flashing |  |
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Group-flashing |  |
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Composite group-flashing |  |
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| 10.5 |  |
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Long-flashing (flash 2s or longer) |  |
| 10.6 | Quick (repetition rate of 50 to 79 - usually either 50 or 60 - flashes per minute) | |||
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Continuous quick |  |
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Group quick |  |
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Interrupted quick |  |
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| 10.7 | Very quick (repetition rate of 80 to 159 - usually either 100 or 120 - flashes per minute) | |||
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Continuous very quick |  |
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Group very quick |  |
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Interrupted very quick |  |
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| 10.8 | Ultra quick (repetition rate of 160 or more - usually either 240 to 300 - flashes per minute) | |||
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Continuous ultra quick |  |
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Interrupted ultra quick |  |
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| 10.9 |  |
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Morse code |  |
| 10.10 |  |
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Fixed and flashing |  |
| 10.11 |  |
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Alternating |  |
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