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Track Correction (1:60 Rule) calculator

Opening Angle (Track-Error)

Distance Off-Track: NM
Distance Travelled: NM
 
Opening Angle °
Closing Angle

Distance Off-Track: NM
Distance Remaining: NM
 
Closing Angle: °
 
Open+Close: °

How Track Error/Correction is calculated using the 1:60 rule


The 1 in 60 Rule states that for every 60 NM (Nautical Mile) distance flown, being 1 NM off-track results in being 1 degree off-track, and vice versa.

Opening and Closing Angles

The Opening Angle (θo), represents the Track Error, and the Closing Angle (θc) the difference between the required corrected track (to the new fix) and the original track to that same fix.

Double Track-Error Method

If the position fix (indicating that we are off-track) occurs before the half-way point of the leg, we can apply the Double Track-Error Method. That is, we apply Double the Track-Error as our Track/Course correction for as many minutes as we have been flying off-track (i.e. from te start of the leg). This method, however, does not work if we have passed the mid-way point between the points on either end of the leg. In such cases, we can apply the Opening and Closing Angle Method.

Opening and Closing Angle Method

Addition of the Opening Angle (θo, Track Error) and the Closing Angle (θc, angular difference to end of leg fix) gives us the Correction Angle we need to apply to our Track/Course.


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