Calculating time using a nautical chart


1 knot = 1 nautical mile per hour


D ÷  = Time (in decimals of an hour)

To convert the decimals into minutes x 60


An example: 

How long will it take to travel 3.2 nautical miles at 10 knots? 

3.2  ÷ 10 knots = 0.32 x 60 = 19.2 minutes 


Fuel Consumption:(Power Vessels) 

Dependant  on your speed, engine type, horsepower etc. 


But a good rule of thumb is 1/3 out, 1/3 back and 1/3 in reserve 


* See Measuring distance on a nautical chart tutorial here

Contact us:


Tel: +44 (0) 1202 406066

Our Location:

Powerboat & Jetski Courses: Port of Poole Marina

Follow us on Facebook:

RYA Training Centre

Marine Education

'The Superyacht Jetski Specialists'

Superyacht PWC

Superyacht Marine Store

Marine Store EU