The Role of Light Characteristics
A navigational light is identified at sea primarily by its colour, its height above water, and its rhythm — the specific pattern of flashes or periods of darkness that distinguish it from neighbouring stations. The International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA) maintains a standardised system of abbreviations and classifications that appears in nautical charts and sailing directions worldwide. Polish stations follow the IALA Region A system, which is standard across Europe.
When a mariner consults a chart of the Polish coast, each lighthouse, light buoy, or sector light is annotated with an abbreviated description. For example, a notation reading Fl(3)W 15s 32m 22M describes a white light that flashes three times in a group, with a period of fifteen seconds, mounted 32 metres above chart datum, and visible for 22 nautical miles.
Fixed Lights
A fixed light (abbreviated F) burns continuously without interruption. Fixed lights are uncommon as primary lighthouse characters because they are easily confused with shore illumination. On the Polish coast, fixed lights appear primarily as sector lights — where the light is continuous but changes colour depending on the bearing from which it is observed. A sector light showing white in the safe approach channel and red on either side of it is a common arrangement at harbour entrances.
Flashing Lights
Flashing lights (Fl) show single flashes at regular intervals, with the period of darkness longer than the period of light. Group flashing lights (Fl(2), Fl(3), etc.) emit a specific number of flashes before a longer period of darkness, making it straightforward to distinguish stations from one another at night. The lighthouse at Rozewie uses a group flashing characteristic; the Hel lighthouse emits a different group pattern. These distinctions are published in the Baltic Pilot and in the Polish Notices to Mariners issued by the Maritime Office in Gdynia.
Isophase and Occulting
An isophase light (Iso) has equal periods of light and darkness. An occulting light (Oc) is one where light predominates — it is mostly on, interrupted by periods of darkness. These characteristics are used where a relatively steady, easily observed light is needed, such as at leading lines that guide vessels along a dredged channel.
Colours and Their Meaning
The three colours used in standard navigational lights are white, red, and green. White typically indicates the safe approach bearing or is used for high-range lighthouses. Red sectors indicate danger areas — shallow water, rocks, or restricted zones. Green sectors, positioned on the opposite side of a channel from red, mark the limit of the safe approach from the other direction.
On the Polish coast, the coloured sectors of harbour entry lights are particularly important at ports such as Gdynia, Gdańsk, and Kołobrzeg, where shallow approaches and shifting sandbanks require careful monitoring.
Fog Signals
Lighthouse stations on the Polish Baltic coast formerly maintained fog signals — horns, sirens, or bells — to supplement visual aids in low-visibility conditions. With the widespread adoption of electronic navigation systems including radar, GNSS, and AIS, many fog signal installations have been decommissioned. However, several stations retain their equipment in operational condition, and the regulations of the Maritime Office specify the conditions under which signals are activated.
Buoys and Minor Lights
Not all navigational lights on the Polish coast are associated with lighthouse towers. A substantial part of the marking system consists of lit buoys, lanterns on piles, and lights mounted on harbour structures. These are documented in the relevant sections of Polish nautical charts (published by the Naval Hydrographic Office in Gdynia) and are subject to the same IALA Region A colour conventions as fixed shore stations.
External References
The official list of lights for the Polish coast is maintained by the Maritime Office in Gdynia. The IALA framework is described in detail in the IALA documentation.