I have GM'ed 3 fishermen so far. (probably done with making Fishers) I have used a couple different macros. One is just for fishing and the other will fish and work another skill (hiding, magery, chivalry etc...). I hope these make sense to you, if not, just let me know and I will try to answer any questions you have.
This is taken from my
Fishing guide:
To simplify fishing you can use a UOA macro to fish. You can run the macro while the boat is moving "slow":
Use item (fishing pole)
Target relative location (next to your boat)
Pause 10000
You can repeat this quite a few times in one macro.
Another useful macro is :
Use item (fishing pole)
Target relative location (next to your boat)
Pause 10000
Use item (fishing pole)
Target relative location (next to your boat)
Pause 5000
Use skill (Hiding, Spirit Speak, Animal Lore etc...)
OR Cast Spell (Magery, Necro, or Chivalry)
Pause 5000
Repeat numerous times in one macro as well.
This macro allows you to fish and work another skill at the same time.