Efforts to mark the target from 5,000 feet on the bombing ranges proved frustratingly difficult. Even when the marker was dropped dead on upon the target, the angular momentum of the marker caused it to slide or skip a hundred yards before coming to a rest. At 5,000 feet they never could get closer than 150 to 300 yards from target. Martin tried using a dive bomb technique, approaching at 5,000 feet and then dropping into a 30-degree dive, releasing the marker at 100 feet before pulling the big Lancaster up. Though the Lancaster was a cumbersome aircraft to attempt it in, the result was absolutely accurate.