Mr nimrod showed us how to build structure with pallets and put them in a square or circle 3-4'ft apart on the first drop off of a spawning flat ideal depth 8-10'!!! We have the structure marked by GPS!!! Gets you in the ball Park or close!! Then use roadrunnners to find the structure!!! Has worked great!!! We just keep adding structure(pallets)(time allows) as we can!! Have placed them out and start catching fish the next day!!!