ILS obstacle clearance
According to my Jepp ATC p215;
"The ILS obstacle clearance surfaces assume that the pilot does not deviate from the centreline more than half a scale deflection after established on track."
It then goes on to say thereafter to maintain the LLZ within half a course sector deflection once established.
Does this translate as "half a dot" or is it half the displayed scale.
I'd appreciate any input on this. rgds