Choose navigation lights by vessel type, length and operating situation, then select a fixture that meets the required function and installation rules. Deck and decorative lighting serve different jobs.
Start with the applicable navigation rules
The Coast Guard's amalgamated rules distinguish International and U.S. Inland requirements. Identify which apply to the water you operate on. Rule 20 addresses when lights are shown; Rules 22–25 and 30 address visibility ranges and common vessel situations.
Under Rule 23(d)(i), a power-driven vessel shorter than 12 meters may use an all-round white light with sidelights instead of the standard Rule 23(a) arrangement. A sailing vessel under sail has a different arrangement; when machinery propels it, use the power-driven requirements.
Anchoring has separate requirements and exceptions under Rule 30. Do not assume an underway configuration answers every anchored situation.
Make a fixture checklist
| Check | Record before ordering |
|---|---|
| Vessel | Length, power or sail, and applicable waters. |
| Light function | Sidelight, stern, masthead or all-round function required for the situation. |
| Visibility | Required range and arc; exact fixture's certification. |
| Electrical fit | Rated voltage and prescribed protection. |
| Physical installation | Mounting angle, height, base and clear sight lines. |
Use the manufacturer's part number and installation sheet. Product names such as “anchor/masthead” do not replace the rule's definition of the needed light.
Example: an all-round fixture
Attwood's LightArmor 5530/5560 catalog family lists USCG certification, 2-mile all-round visibility and use for boats up to 12 meters, with specific compatible bases. This illustrates what to look for in a fixture specification; it is not a certification of every Attwood model or every mounting arrangement.
Check the finished installation
After installation, review the required arcs and positioning against the rules and the fixture manual. Include tops, rails and equipment in the obstruction check. Record the light's part number and base so future replacements can be matched.
If your vessel or operating situation falls outside the example above, use the full rules and qualified installation advice rather than extrapolating a small-powerboat arrangement.
Compare marine lightingReferences checked October 2026. Confirm exact model instructions before installation.