Poseidon, God of the seas, has sent many a disrespectful sailor on ludicrous odysseys. But those who render homage to him, can expect that their ship will sail over calm waters and will be lead through perfect winds and onto their destination harbour (harbor). Poseidon shortens the travel time of all the ships that begin their journey while the miracle is activated.
This option is additive (not multiplicative) with Triton Engines and / or Draft, if they are also used to increase your Cargo Ships speed to transport resources.
The increased speed effect also applies to Piracy raids.