![]() is amplified and displayed on the instrument Ĭheck Understanding Distance on the earth’s surface is measured in nautical miles.A simplified ASI Pitot Tube Airstream Dynamic + Static Static Static Tube But below the diaphragm is just Static.A simplified ASI Pitot Tube Airstream Static Tube caused by forward motion of the aircraft.The Air Speed Indicator (ASI) measures.(remember 1’ of latitude is 1 nautical mile (nm)).For aircraft, the speed is a measure of:.for cars, motorcycles and land vehicles:.Meridian Calculation N 51º 24’ First Latitude N 40º 29’ Second Latitude: 10º 55’ Subtracting gives: Now convert 10º 55’ into nautical miles: 10º multiply by 60 = 600 Add the 55’ = 655 nm Meridian Calculation N 51º 24’ First Latitude N 40º 29’ Second Latitude ? 10º 55’ Subtracting gives Remember – 60 degrees to a minute Because 29’ is more than 24’ 60’ minus 29’ = 31 As we carry 1 across, we now have 51º – 41º = 10º Plus 24’ = 55’ The starting point goes through Greenwich and is referred to as the ĭistances Between Points Nautical maps have no scales on the borders, we use the nm scale shown on each meridian.ĭistances Between Points If two places are on the same meridian (longitude) then it is possible to calculate the distance between them, rather than having to actually measure it.ĭistances Between Points For example: Torrejon airfield (in Spain) is due south of RAF St Athan (in Wales) on the same meridian These two latitudes are N40✢9’ and N51✢4’ So how do we calculate the distance between them?.The line of Latitude must be given first.As a complete circle is 360° then 360 x 60 gives the circumference of the Earth as 21600 nm (approx 25000 statute miles). ![]() RECAP Latitude and Longitude lines divide the surface of the Earth into degrees and minutes. One minute of latitude represents one nautical mile (nm) 1 degree of latitude (60 minutes) equals 60nm
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