Hi,
An otter board or lathe is, usually, a piece of wood about 12" X 8" with a lead strip along one of the long edges to help it sit upright in the water. It is attached to a long line used to pay out lures, flies or whatever, that are suspended by another length of line from the board. The board can be directed/guided to where you want using wind or current and by using the long line as a control. It is illegal and regarded as a prohibited instrument in England and Wales. What 'Main Man' is referring to is, in my neck of the woods, called an otter and as he says used to help release sn