Yes, have to go to the hall for a job but there’s no requirement to hang around, or even go to job call in the first place, If there’s jobs on the open board just walk in and claim one.
Otherwise as far as how to get a job what tactic works best depends on the situation and circumstances.
In John McPhee’s book “Looking for a Ship” the tactic of “laying for a ship” is described.
EDIT - just saw this on the pay thread: