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  2. 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 ...

  3. Sliding window protocol - Wikipedia

    en.wikipedia.org/wiki/Sliding_window_protocol

    A sliding window protocol is a feature of packet-based data transmission protocols. Sliding window protocols are used where reliable in-order delivery of packets is required, such as in the data link layer ( OSI layer 2 ) as well as in the Transmission Control Protocol (i.e., TCP windowing ).

  4. Navigational aid - Wikipedia

    en.wikipedia.org/wiki/Navigational_aid

    In IALA region A where a minor channel branches off to port the mark at the junction would be a red cylinder with a green band. The red cylinder is a port hand mark for the main channel, the green band indicates a starboard mark for the minor channel. [3] In IALA region B the colours (but not shapes) are reversed. [4]

  5. Electronic navigational chart - Wikipedia

    en.wikipedia.org/wiki/Electronic_navigational_chart

    An Electronic Navigational Chart (ENC) is a digital representation of a real-world geographical area for the purpose of Marine navigation.Real-world objects and areas of navigational significance, or to a lesser degree - informational significance, are portrayed through Raster facsimiles of traditional paper charts; or more commonly through vector images, which are able to scale their relative ...

  6. Fairway (navigation) - Wikipedia

    en.wikipedia.org/wiki/Fairway_(navigation)

    The term "fairway" usually means all the navigable waters between the fairway buoys (that indicate the ends of the channel), even the routes only accessible to the lighter-draft vessels. [1] Some authors restrict the definition to the linear approach part of a marine waterway, the approach channel leading into a port. [5]

  7. 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.

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  9. NAVTEX - Wikipedia

    en.wikipedia.org/wiki/NAVTEX

    A NAVTEX receiver prints an incoming message NAVTEX message for the Baltic Sea. NAVTEX (NAVigational TEleX), sometimes styled Navtex or NavTex, is an international automated medium frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information (MSI) to ships.

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