When a course is plotted at minimum time track, one passes from the air isochrone to the corresponding ground isochrone by applying to the air isochrone a vector which is equal to:

1) Given:Distance 'A' to 'B' is 100 NM,Fix obtained 40 NM along and 6 NM to the left of course.What heading alteration must be made to reach 'B'?

2) A ground feature was observed on a relative bearing of 3250 and five minutes later on a relative bearing of 2800. The aircraft heading was 1650(M), variation 250W, drift 100Right and GS 360 kt. When the relative bearing was 2800, the distance and true bearing of the aircraft from the feature was:

3) An island appears 300 to the right of the centre line on an airborne weather radar display. What is the true bearing of the aircraft from the island if at the time of observation the aircraft was on a magnetic heading (MH) of 3550 with the magnetic variation (VAR) 150E?

4) An island appears 300to the left of the centre line on an airborne weather radar display. What is the true bearing of the aircraft from the island if at the time of observation the aircraft was on a magnetic heading (MH) of 0200 with the magnetic variation (VAR) 250W?

5) When a course is plotted at minimum time track, one passes from the air isochrone to the corresponding ground isochrone by applying to the air isochrone a vector which is equal to: