In this era of GPS whilst perusing the 1970 FRA Calendar I was interested to see the following navigational advice:

Ennerdale Horseshoe: Fairly obvious route - some navigation necessary, definitely in bad weather.

Three Peaks: Fairly obvious course but navigation required in bad conditions.

Fairfield : Fairly obvious course, "defined in parts".

Well everything is relative and so the 50 mile Fellsman Hike is categorised as Navigational Skills Necessary.