航こう路ろ標ひょう識しき

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Meanings

1

noun

sea mark; beacon

A navigational aid for maritime traffic, such as a lighthouse, buoy, or daymark.

navigate, sail, cruise

路path, route, road

標signpost, seal, mark

識discriminating, know, write

灯とう台だい
灯台 specifically refers to a lighthouse, while 航路標識 is a broader term covering all types of navigational aids.
ブイ
ブイ is a buoy, which is one type of 航路標識.

Compound of 航路 (sea route) and 標識 (mark, sign).