I'm looking to purchase a decent locator. I use a handheld Garmin for my GPS, but wondering what a good sonar would be to locate those fish in Burwell. The fish finder I use now only shows big black blobs which I take for bait fish. Maybe they are eyes, even sheep. If anyone can help on what I should be looking for would be greatly appreciated. Not looking to break the bank but something in the $300-500 range would be a good start. Thanks.