Marinetraffic has everything to do with the "color" of the ships on its
website. The AIS transmitters on the ships send a coded number that
indicates what type of ship. This is input by whoever programs the
transmitter. There is no color at this stage, just a number.
When someone wants to do a visual representation of AIS data, they can use
color if they want. It will be arbitrary and will only reflect what type of
ship the programmer set the transmitter up for. Not the actual type, color,
owner or anything else about the ship.
That said, it seems like most software at least show tankers in red. That's
about the only trend I've noticed.
If you have a boat and a smartphone, get an MMSI for the boat, download the
iAIS app and see for yourself.
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