What must an angler do regarding anchor placement when using a chum slick over a promising reef?

Set up an anchor far enough upcurrent so the slick drifts over the target area

A common and successful methodology for enticing wary Yellowtail Snapper involves the strategic deployment of a chum slick. Since the fish can be cautious, the angler must ensure the attractant flows directly to where the fish are holding without spooking them or drifting past them. To achieve this desired effect, the boat should be anchored upcurrent relative to the promising reef or marked structure. By setting the anchor position upstream, the current will carry the deployed chum slick directly across the target structure and past the boat. This steady flow of attractant keeps the usually wary Yellowtails grouped near the vessel, thereby increasing the probability that their nearly invisible presentations will be mistaken for an easy meal.