Indicates whether the game client (rather than the player) can see unit.
- (String unit)
- UnitId of the unit
- Number - 1 if client can see unit, nil if not
- The game client can see objects (including units) that the server has told it to load (and has not yet told it to unload). The server provides objects in a 100-yard radius, but seems to load them in batches.
- This does not check for line-of-sight, only for game client visibility.