Chart correction NNU-324682 — chart 200
изменена характеристика · Portland Head Light · Fl W 4s 97ft 14M HORN (MRASS) · Lighted throughout 24 hours. Emergency light of reduced intensity when main light is extinguished.
Source: NOAA Nautical Updates — critical (US waters)
Reference information — always verify against official Notices to Mariners before navigation.