NavList:

RTFM is how computer developers say 'read the _____ manual', often to the end-user.

But this is somewhat to the point - the Hanno Ix chart doesn't really have a clear 'manual' of instructions that can be followed (or at least I haven't been able to find one). Nothing explicit like the haversine formula instructions, where, for example: 

if Latitude N:
 if LHA > 180°, Zn = Z
 if LHA < 180°, Zn = 360° − Z
if Latitude S:
 if LHA > 180°, Zn = 180° − Z
 if LHA < 180°, Zn = 180° + Z