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caravels
to travel from one place to another with safe and sound navigation
He had to do some navigation to travel trough the sea.
Aftermarket navigation systems are portable and affordable. There are even apps that can be downloaded to your iPhone at http://www.apple.com/webapps/travel/webbasedcarnavigationsystem.html
The word due as used in navigation means directly. If a heading or direction of travel is specified as "due west" in some instructions, it means directly to the west. To get to the nearest border, travel due west.
To know water depths you need a fathometer. For navigation GPS is recomended.
By sails and oars. They could also travel out of sight of land by astral navigation.
it does not
it affect world travel by all the rain that can cause accidents
The degrees of heading is used in navigation, and means the compass point (in degrees) of travel.
nautical
phones,navigation systems by dlb