I agree with Alex. Common standard parallels are used in some regional sets. The publisher in question addresses this in its FAQ
Quote:
Q. Why does the scale of the VFR+GPS charts differ slightly from 1:500.000?
A. In order to support the European wide standard, a Lambert Conformal Conic Projection with Standard Parallels at N37° and N65° is used for production of all VFR+GPS charts. This enables the seamless combination of all charts and the use for continuous flight planning. A scale distortion is a consequence of the projection and varies with the distance from the Standard Parallels. The true scale is depicted on every VFR+GPS chart on the Cover panel (e.g. EB/EH: True Scale at N51° - 1:515.000) and near the Scale Bar. In addition, a factor is given to multiply measured distances with every parallel (e.g. 1.03).
Awesome! thank you very much! This clears all the doubts.
@
dook , @
Alex Whittingham and
@selfin thank you very much for your help. I appreciate all the help and input you gave.