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2. Marine VHF radio - Wikipedia

   en.wikipedia.org/wiki/Marine_VHF_radio

   The original allocation of channels consisted of only channels 1 to 28 with 50 kHz spacing between channels, and the second frequency for full-duplex operation 4.6 MHz higher. Improvements in radio technology later meant that the channel spacing could be reduced to 25 kHz with channels 60 to 88 interspersed between the original channels.

3. Clear view screen - Wikipedia

   en.wikipedia.org/wiki/Clear_view_screen

   Other common names for it include "clear sight", "spin window", "Kent Screen" and "rotating windshield wiper". Clear view screens were patented in 1917 by Samuel Augustine de Normanville and Leslie Harcourt Kent as a stand-alone pillar-mounted screen, [ 1 ] with later patents for telescope and optics covers, followed by the more familiar ships ...

4. 2182 kHz - Wikipedia

   en.wikipedia.org/wiki/2182_kHz

   2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, [3] communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 100 nautical miles (90 to 190 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night.

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   www.aol.com/local

   Get the latest news, politics, sports, and weather updates on AOL.com.

6. Porthole - Wikipedia

   en.wikipedia.org/wiki/Porthole

   A porthole, sometimes called bull's-eye window or bull's-eye, [1] is a generally circular window used on the hull of ships to admit light and air. Though the term is of maritime origin, it is also used to describe round windows on armored vehicles , aircraft , automobiles (the Ford Thunderbird a notable example) and even spacecraft .

7. Bridge (nautical) - Wikipedia

   en.wikipedia.org/wiki/Bridge_(nautical)

   A bridge (also known as a command deck), or wheelhouse (also known as a pilothouse), is a room or platform of a ship, submarine, airship, or spaceship from which the ship can be commanded.