Is it night, dense fog, fog with visibility under 2nm, a heavy rainstorm? As you may know, the Navigation Rules do not precisely define restricted visibility. However, it is not night by itself, but it is anything that impairs visibility to some degree (fog, rain, snow, dust, smog, haze, smoke, sandstorm, blizzard, etc.)
If you are near an area of restricted visibility, you are considered to be in restricted visibility for the purposes of the Rules. Rule 19 of the Navigation Rules has the rules for the conduct of vessels in restricted visibility when they are not in sight (visually) of each other. Rule 35 has the required sound signals. See www.navcen.uscg.gov/?pageName=navRulesContent for the text of Rules 19 and 35.
If you are near an area of restricted visibility, you are considered to be in restricted visibility for the purposes of the Rules. Rule 19 of the Navigation Rules has the rules for the conduct of vessels in restricted visibility when they are not in sight (visually) of each other. Rule 35 has the required sound signals. See www.navcen.uscg.gov/?pageName=navRulesContent for the text of Rules 19 and 35.
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