Flew from N Yorks to Boston today. Part of route was throgh the stub between Cranwell and Coningsby. I particularly noticed a difference of some 0.5 miles between Garmin (Jeppesen) and SkyDemon re the southern stub boundary. According to SD I reached the s Boundary about 0.5 miles before Garmin said so. One has to be wrong. Pains me to say it but suspect Jeppesen is correct.

Other than that 8410/SD worked flawlessly.

Also location of my home field, Husthwaite is wrong in SD. I know this because when you are on the runway, airfield loaction on SD is about 0.3 miles south.

Conversely, all roads are exactly right  .. going by test when just driving about.

Any thoughts Tim?

David

Your comparison to road junctions is interesting. Although our aeronautical data is all accurate, our geographical scenery, which includes roads and coastline, is public domain data which can be off in some places by up to a mile. We deem this acceptable in SkyDemon as it's for aeronautical navigation, but do be aware of the possibility.