Flares and Visual Distress Signals

Types of Flares

Marine distress flares are not interchangeable — each type has a specific purpose, effective range, and day/night applicability. Carrying the right types and knowing when to use each is the difference between being found and being missed.

SOLAS parachute rocket flare: The primary offshore distress signal. Launched from a tube, the rocket rises to approximately 300m and deploys a parachute-borne red flare burning for 40 seconds as it descends. Visible up to 28nm in good visibility. This is the signal you fire when you see a vessel or aircraft in the distance — it gives them 40 seconds to take a bearing on you.

Handheld red flare: Burns for 60 seconds at ground level. Effective range approximately 5–10nm. Used when a vessel or rescue craft is close and you need to mark your exact position. In fog or behind waves, the parachute rocket may not be seen; a handheld at water level can be.

Orange smoke: Day use only. Produces a dense cloud of orange smoke for 50–60 seconds. Excellent for helicopter approaches and aircraft — smoke indicates wind direction to the pilot as well as position. Useless at night or in heavy rain. In light air, orange smoke is the most effective helicopter homing signal available.

White flare: Not a distress signal. Used as a collision avoidance warning — to alert another vessel that has not seen you. Fire it to illuminate your presence, not to signal distress. White flares are a COLREGS tool.

Miniflares (pen-gun type): Small cartridge flares in a pen-sized launcher. Range is minimal and burn time short, but they are compact and can be carried in a pocket or grab bag. Better than nothing when the main flare kit is inaccessible.

Legal Requirements and Expiry

Carrying the correct flares is a legal requirement in most jurisdictions, not just good practice. USCG, SOLAS, and national regulations specify minimum carriage requirements for recreational vessels.

USCG requirements for recreational vessels on coastal waters, Great Lakes, and territorial seas: All vessels must carry visual distress signals approved for both day and night use. Three SOLAS-approved handheld red flares satisfy both day and night requirements. Alternatively, one day signal (orange flag or smoke) plus one night signal (electric distress light or red handheld) is acceptable.

Offshore passages: The ISAF Offshore Special Regulations (for race entries) and most offshore rally requirements specify SOLAS-grade flares: minimum four parachute rockets, four handheld red, two orange smoke. Even if not racing, this standard is a sensible minimum for any offshore passage.

Expiry dates: Flares expire 42 months after manufacture date, printed on the tube or canister. An expired flare is not legally compliant and may fail to function. The failure rate of expired flares is significant — the propellant degrades and the igniter corrodes. Keep expired flares as backup only.

Disposal: Expired flares cannot be put in household waste. Many marinas operate flare disposal programs. The USCG and Coast Guard vessels sometimes collect expired flares at safety days. Stockpiling expired flares in the bilge is not a substitute for in-date flares.

How and When to Use Flares

The most common mistake with flares is firing them too early — when no one is in range to see them — or too late — when the rescue craft is already overhead and a flare fired into the sky is a hazard.

When to fire a parachute rocket: Only when a vessel, aircraft, or rescue craft is visible or within earshot. A parachute rocket burns for 40 seconds at high altitude. If no one is watching that patch of sky, it is wasted. Fire the second rocket 20–30 seconds after the first, while the first is still visible, so rescuers can take a bearing.

Firing technique — parachute rocket: Read the instructions printed on the tube before you need them. Hold the tube pointing slightly into the wind, 15 degrees from vertical. Do not fire directly into the wind (the spent casing returns) or directly downwind (casing lands beyond the signal). Keep arms clear and do not lean over the tube.

When to fire a handheld: When a rescue craft is within close range (under 5nm) and you need to mark your exact position. Hold downwind, arm extended, away from any crew member. The handheld burns at close to 1000°C — do not hold it over the water (water splash can cause the flare to flare back), and do not hold it inverted.

Orange smoke: Deploy upwind of your position so the smoke drifts toward the approaching aircraft or vessel. For helicopter SAR, smoke is the preferred homing signal — it shows wind direction and speed at sea level as well as position.

Saving flares: Firing all flares at the first sight of a vessel is a common and serious mistake. Ration flares: fire one to attract attention; fire another when they have clearly responded or changed course toward you. Keep at least one parachute rocket and one handheld in reserve until rescue is confirmed.

Non-Flare Visual Distress Signals

Flares are not the only visual distress tool. Several non-pyrotechnic signals are highly effective — and don't expire or require careful storage.

Signal mirror (heliograph): In sunlight, one of the most effective long-range distress signals available. A polished mirror with a sighting hole can reflect sunlight visible to aircraft at 10nm or more. Technique: hold the mirror near your eye, look through the sighting hole, aim the reflected light spot at the target, and flash. Practice this — it is a learnable skill. Works only in direct sunlight, but on a clear day offshore it is remarkably powerful.

SART (Search and Rescue Transponder): A radar transponder that activates on receiving a 9GHz radar pulse (standard ship's radar). The SART responds with a series of 12 blips in a line on the rescuer's radar display, visible to approximately 10nm. A rescuer seeing the blip pattern homes in on the strongest signal. AIS-SARTs do the same via AIS (automatic identification system) and can be seen on chart plotters. Modern AIS-SARTs are increasingly preferred over radar SARTs as most vessels monitor AIS.

Dye marker: An orange or yellow fluorescent dye released into the water, spreading a highly visible patch visible to aircraft. Particularly useful in searches with consistent wind and current — the dye patch drifts with the conditions, and the search pattern can account for it. Dye is less visible from vessels at water level.

International distress signals (Rule 37, COLREGS): Any of the following are internationally recognised distress signals: SOS by any means; continuous soundings on fog horn; flames on the vessel (burning oil, flares); NC flag signal (International Code of Signals); square flag with a ball above or below it; slowly and repeatedly raising and lowering outstretched arms (the V wave signal).

Orange distress flag: A solid orange flag — on a stiff day clearly visible at range and legally recognised. No expiry, no pyrotechnics. Required for day use compliance alongside a night signal in USCG minimum equipment rules.