Great white shark sightings and detections are starting to increase along the Cape as the weather heats up and more people head to the ocean. One great white shark — a nearly 11-foot female tagged off the Cape last summer — has already traveled north of Provincetown, according to OCEARCH’s shark tracker. Meanwhile, the Atlantic White Shark Conservancy Sharktivity app has recent shark sightings during the first week of June. A pilot flying out of Chatham Airport during a sightseeing tour last week spotted a great white about a half mile off Marconi Beach in Wellfleet. The Sharktivity app is...