The distance from an airport shown in the top display becomes increasingly inaccurate as the distance is increased. The destinations flown to are shown with the distances from Reedley as calculated by SkyVector compared with the top display in Aerofly 2, followed by the Aerofly 2/SkyVector ratio.
SkyV AeroF Ae/Sk
1458 1449 .994 Oshkosh
1863 1835 .985 Barrie
2108 2061 .978 Montreal
2909 2810 .969 St Johns
4263 3981 .934 Belmullet
4329 4040 .933 3nmFinals Galway exactly
4404 4098 .931 5.5nmFinals DublinR28 exactly
4635 4278 .923 Calshot near Isle of Weight
4744 4370 .921 Coast France
5056 4601 .910 6nmFinals Zurich exactly
Two sources were used for the calculated over the surface great circle distance to Zurich
5047nm and 5050nm Reedley-Zurich from Air.distance and SkyVector.
5053nm and 5056nm to Zurich 6 nm finals.
The top display range from an airfield seems to be similar to a straight line distance as if measured along a tunnel dug between two widely separated points on the earth's surface. The furthest distance flown was to Zurich so the through ground straight line distance can be estimated.
The great circle distance of 5056 nm can be divided by 60 to give a direct length of arc of 84.266 degrees. 1/2 of this angle can be used to make a right angled triangle to get the sin, the opposite will represent a half of the direct distance across the arc.
This is 42.133 degrees, the sin of which is 0.6709, which times twice the earth radius hypotenuse will give the distance across.
0.6709 x 3440 nm (earth radius) x 2 (half reversed) equals 4615 nm.
Which is close to what Aerofly 2 indicates in the top display. So for long flights the top display seems to give a strange and not really useful distance indication.