Sky High Bull's-Eye offers aerial targets for drones, GCP target mapping & ground control point markers. Use UAV surveying for high-altitude mapping.Our UAV GCPs have a center passthrough for survey stakes. They are durable, lightweight & have an anti-reflective coating for easy visibility for 400ft.Best Ground control points (GCPs) for UAV mapping. Center passthrough design, numbered targets, durable grey color for improved mapping.Get precise measurements every time with this Iron Cross Ground control points (GCPs). Avoid tearing by inserting your surveying rod into the center eyelet.Get the ultimate Ground control points (GCPs) for UAV Pilots that can easily overlay on preexisting survey markers. Its durable mesh design is reusable.Durable Checkered Ground Control Point (GCPs) is perfect for UAV Pilots. Easily insert your surveying rod into the center eyelet for precision measurement.