Every visual distress signal, regardless of type, must carry a U.S. Coast Guard approval number, remain in serviceable condition, be readily accessible on the vessel, and be used only in genuine emergencies. These four requirements apply universally, whether the signal is a handheld red flare, an orange smoke canister, or an electronic distress light. If you’re preparing for a boating safety course, these shared traits are what the question is testing.
Coast Guard Approval and Marking
All visual distress signals must be legibly marked with a Coast Guard approval number. This number confirms the device was tested by an independent laboratory and met the minimum performance standards set under Title 46 of the Code of Federal Regulations. The Coast Guard itself does not test the equipment. Instead, it specifies the required test methods and criteria, and an accepted lab performs the evaluation. Once a device passes, it receives a formal Certificate of Approval.
Production doesn’t end there. The accepted lab must also conduct ongoing production inspections and submit annual reports to the Coast Guard. This means every approved signal, not just a prototype, is held to a consistent manufacturing standard.
Serviceable Condition and Expiration
Every visual distress signal must be in serviceable condition. For pyrotechnic devices (flares, smoke signals, rocket-propelled flares), this includes a mandatory expiration date printed on the device. Federal regulations cap that date at 42 months from the date of manufacture. Once a pyrotechnic signal passes its expiration date, it no longer counts toward your required number of signals on board.
Non-pyrotechnic signals like electric distress lights and orange distress flags don’t carry the same expiration stamp, but they still must be functional. A corroded battery in an electric light or a torn, faded flag would not meet the “serviceable condition” requirement. Checking your signals before every trip is the practical takeaway here.
Readily Accessible Storage
Signals must be readily accessible, not buried in a locker under gear. For pyrotechnic devices specifically, federal rules require them to be stowed in either a portable watertight container kept at the operating station or a secured pyrotechnic locker above the freeboard deck, away from heat sources and near the helm. The container must be a bright color and clearly marked with “DISTRESS SIGNALS” in contrasting letters at least half an inch high.
The logic is straightforward: a signal you can’t reach quickly in an emergency is useless. Accessibility is a legal requirement, not a suggestion.
Emergency Use Only
Visual distress signals may only be displayed when there is immediate or potential danger to the people on board a vessel. Federal law (33 CFR § 175.140) explicitly prohibits using them under any other circumstance. Setting off a flare for fun, to celebrate, or to test it on the water is illegal. False distress signals can trigger expensive search-and-rescue operations and divert resources from real emergencies.
Day, Night, or Both Classifications
Every approved signal falls into one of three categories: day only, night only, or day and night. This classification determines when and how you can use each device to satisfy carriage requirements.
- Day only: Orange smoke signals (handheld or floating) and orange distress flags. These are visible in daylight but ineffective in darkness.
- Night only: Electric distress lights that produce a flashing SOS pattern. One light satisfies the nighttime requirement.
- Day and night: Red flares, including handheld red flares, parachute red flares, and red aerial pyrotechnic flares. Their bright flame and color work in both conditions.
You need signals that collectively cover both day and night, or you can carry combination devices rated for both. For example, three handheld red flares (rated day and night) satisfy the full requirement on their own. But three orange smoke canisters only cover daytime, so you’d still need a separate night signal.
Who Must Carry Them
Boats 16 feet or longer operating on coastal waters or the high seas must carry visual distress signals suitable for both day and night use. Boats under 16 feet have a narrower obligation: they only need night signals, and only between sunset and sunrise.
A few categories get partial exemptions. Participants in organized races or regattas, people in manually propelled boats (kayaks, canoes, rowboats), and sailors in completely open sailboats under 26 feet without a motor are exempt from daytime requirements. But even these groups must carry night signals when operating between sunset and sunrise. No recreational vessel on coastal waters is fully exempt after dark.
Required Quantities
The number of signals you need depends on which type you choose. Handheld red flares require three. Floating or handheld orange smoke signals require three. A single parachute red flare meets the day-and-night requirement by itself. Red aerial pyrotechnic flares require two. One electric distress light covers the night-only requirement, and one orange flag covers the day-only requirement. You can mix and match as long as both day and night are covered in the quantities listed for each device type.
Expired pyrotechnic signals can still be kept on board as extras, and many boaters do keep them as backups. But they cannot be counted toward the minimum required number.