My own review of this suggests that the data on the Airfield in the F-10 menu is static, and not linked to the values of the field, to Baileys point, the runway lengths differ significantly, and the elevations are inconsistently measured especially since these excellent fields all tend to vary in height. I think also the GPS position in a lot of cases seems to be mostly based on the location of the Western most Keys rather than the centre of the airfield.