A "bird". planner board etc. goes out there and stays. Something very useful when sailing. I'm planning on using one when I get the sail equation worked out.
But Josh on KFS came up with this site:
Some great stuff in there for you as a Delta fisherman.
And for me?
Check the sketch and description under #9 on "Top ten reasons."
If this works as decribed it's going to change some stuff while trolling at low kayak speeds on open ocean. All IMHO.
Anyway I order a few to test. Certainly cheap enough.