It seems probable that the scale was also marked in divisions of so many leagues, to indicate in linear terms how far north or south of his destination the pilot was.
Ibonaka ngokungathi ukuba isikeyile sasiphawulwe naso kwizahlulo zomgama omninzi, ebonisa imigca emide kukude kangakanani emntla okanye entshona lwendawo yokufika yayo umqhubi.