Distance

Distance
Distances within FFXI are measured in terms of an arbitrary unit of distance commonly referred to as "feet", and indicated with the ' symbol. Precise distances are only accessible through third-party programs, but FFXI provides various clues for judging distance without them:

If you are fighting an enemy that uses AoE special attacks, it is very useful to know the range of its attacks so you can stay outside of it. Here are some examples: