So, both new boats are 26 metres long, with a max speed of 20 knots *)
* Daskalogiannis: length of 60 metres with a max speed of 13 m/h (21 km/h)
Speed recorded (Max / Average) [From: https://www.marinetraffic.com/en/ais/de ... ALOGIANNIS
10.4 / 9.5 knots
10.4 knots = max speed of 19,2608 km/h
* Samaria: length of 48 metres with a max speed of 13 m/h (21 km/h)
Speed recorded (Max / Average) [From: https://www.marinetraffic.com/en/ais/de ... :SAMARIA_I
10.1 / 9.3 knots
10.1 knots = 18.7052 km/h
* Neptune: length of 20 metres with a max speed of 11 m/h (17.7 km/h).*)
A nautical mile is based on the circumference of the earth, and is equal to one minute of latitude. It is slightly more than a statute (land measured) mile (1 nautical mile = 1.1508 statute miles). Nautical miles are used for charting and navigating.
A knot is one nautical mile per hour (1 knot = 1.15 miles per hour, 1.15 miles per hour =1.85 kilometers per hour). The term knot dates from the 17th century, when sailors measured the speed of their ship by using a device called a "common log." [A chip log, also called common log, ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot, to mean nautical mile per hour, derives from this measurement method.] This device was a coil of rope with uniformly spaced knots, attached to a piece of wood shaped like a slice of pie. The piece of wood was lowered from the back of the ship and allowed to float behind it. The line was allowed to pay out freely from the coil as the piece of wood fell behind the ship for a specific amount of time. When the specified time had passed, the line was pulled in and the number of knots on the rope between the ship and the wood were counted. The speed of the ship was said to be the number of knots counted (Bowditch, 1984).
All the best,