These lightweight, foldable GCPs are easy to transport and carry. If the wind is a concern, simply use the 4 corner eyelets to anchor the GCP to the ground to ensure that the GCP stays in place. For survey, simply insert the tip of your surveying rod into the center eyelet for a precision measurement every time. With an ideal 120cm by 120cm size, these GCPs are perfect for UAV mapping. Take your drone mapping to new heights today with this new set of GCP 5 Pack!