I use a 6:3 on shallow...when it gets past about 8-10ft...I go with either a 5:1 or a 5:3...just because its soo much easier to work if you are throwing them for any length of time.
I feel like I have a better feeling of the bottom and bites when I have a lowe ratio reel, may just be a mind thing, but oh well.
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1995 Welded 1542 Jon Boat - carpeted casting decks
1992 Johnson 25hp Motor
Humminbird 798SI (yep I put side imaging on a jon boat)