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US Naval vessels are still screened when moving. But all of those WWII vessels were used up during the Vietnam era, and have since been replaced by sophisticated computers which have enhanced aircraft/submarine/missile defenses.
Stated another way, US naval vessels aren't crossing oceans the way you see them on old WWII television films; a convoy ringed by destroyers (although it can still be done). 21st century naval vessels still cross oceans, but with the technology mentioned in the first paragraph. The ships move, and are monitored the whole way...if and when trouble erupts, that technology is activated.
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What kind of ships did the Polynesia use?
Double hulled ships, outriggers Double hulled ships, outriggers
How did technology help European sailors during the age of exploration?
The technology in the 1400-1500's made ships better for sailing by the use of rudders, moveable sails, and larger ships. Navigating became better through the use of the astrolabe and better compasses. Mapping also was better.
What where the navigational tools the sailors could use during the 15th century?
Compass and astrolabe. Along with larger ships and the movable sail it allowed for exploration.
What transportation did Giovanni use?
he used ships
What are ships to ship signal flag communications?
It is a semaphore. They use flag signals to communicate with other ships.
