Historically, the nautical mile was defined as ...

one minute of latitude
one hour cruise on average wind
1/12 distance from Calais to London
1000 English yards
In 1929, the international nautical mile was defined by the First International Extraordinary Hydrographic Conference in Monaco as precisely 1,852 meters. The United States nautical mile was defined as 6,080.20 feet (1,853.24 m) based in the Mendenhall Order foot of 1893. It was abandoned in favour of the international nautical mile in 1954. The Imperial nautical mile, often called an Admiralty mile, was defined by its relation to the Admiralty knot, and was abandoned in 1970.
Katarzyna DÄ…browska
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Answers by country

one minute of latitude
one hour cruise on average wind
1/12 distance from Calais to London
1000 English yards
answers
flagAustralia
75%
14%
0%
10%
28
flagGreece
63%
5%
5%
26%
19
flagthe Netherlands
60%
20%
0%
20%
25
flagAustria
53%
5%
10%
31%
60
flagthe United Kingdom
50%
4%
9%
28%
88
flagGermany
48%
4%
14%
30%
357
flagthe United States
48%
15%
14%
20%
117
flagCanada
42%
14%
7%
35%
14
flagPoland
41%
11%
12%
32%
7571
flagRepublic of Ireland
41%
16%
0%
33%
12
flagIndia
21%
27%
27%
22%
61
flagSwitzerland
21%
14%
14%
48%
41
flagFrance
20%
10%
20%
50%
10