What's that knot?
Ship parts
Legendary sailors
100
Figure of eight knot
Used at the ends of the ropes (sheets) to keep them from slipping through the holes at the side of Ture's boats.
Ottetalsknob
100
Anchor
100
Italian explorer and colonizer who "discovered" the Caribbean and Central and South America from 1492 and onwards.
Christoffer Columbus
200
Square knot
Used for tying two ropes together.
Råbåndsknob
200
Looking for two words here :)
Mast and sail
200
Norwegian adventurer who sailed his raft "Kontiki" from South America to to the Tuamutu Islands (1949) in the Pacific to prove that humans could have spread to the Pacific islands that way. 
Thor Heyerdahl
300
Round turn and two half hitches
Used for tue the boat to the dock (among many things).
Rundtørn med dobbelt halvstik om egen part
300
Heavy attachment to the hull.
Gives the boat extra stability.
Keel
300
Sailed the Danish shop Nordkaperen around the globe several times. Known from TV and books.
Troels Kløvedal
400
Bowline
Used for tying one thing to another by making a look around it. For example: tie the black buckets to the inside of Ture's boats. 
Pælestik
400
The thing that controlls the direction of the boat
Rudder
400
British discoverer and captain who led many expeditions to the Pacific and "discovered" Australia in 1770.
Captain James Cook
500
Sheet bend
Used for tying two ropes together. Especially if they are of different thicknes.
Flagknob
500
Which side of the ship is facing towards the dock?
Starboard
500
The youngest person ever to sail around the world alone (at 16 years old).
Laura Dekker (from Holland)