What to get depends on your budget.
Sonar units range in price from $100-$3,000 plus attachments. The base units are great, however the higher end units can do some amazing things.
Trolling motors also have a wide range of price- $100-$2,000 or so. Base units are okay, however the higher end units can link to your sonar unit and follow a path you choose, or hold a spot.
I think if we narrowed the price range or had a list of features your looking for we could give more direction.
HOI Crappie Club
Where family and friends come to compete for a little more than bragging rights.
Quick, someone teach me how to fish so I can win this tournament!!!