That chart is part of the AIP. How do you think they get the details where to put the little blue circles?
An "entry in the AIP’ is commonly understood to be a chapter in the section AD, not a circle on the map.
I reckon the CAA keep some ad hoc database of farm strips. They also have the Lockyears book which lists some % of farm strips – in many cases against the owner’s wishes. Everybody doing moving map apps (EVFR, SD) will be doing the same thing themselves.
The CAA has some criteria for displaying them e.g. there are (according to Sussex Police) 82 farm strips in Sussex, but the charts shows only a handful. And it cannot be based on the owner not wanting visitors because there are plenty of “absolutely strictly PPR” strips on the 500k chart already; in fact most farm strips are already in that category.
This is becoming a circular discussion. Returning to the exam question.
The Civil Aviation Authority and NATS are conducting a survey to validate the list of various unlicensed airfields and aerial sporting activity locations published in the Aeronautical Information Publication (AIP) and depicted on CAA VFR charts. The reason for this survey is to establish whether existing published sites in the AIP are still current, operating, accurately reflected in AIS products, and to identify a principal point of contact for each site.
