The lensatic compass is both rugged and highly accurate. Be careful not to lower the magnifying lens too much when taking your reading, as this may magnetically lock the needle. This feature keeps the needle from “bouncing” when closed and in a pack, extending its life and lowering “wear and tear”.We offer a full online/video land navigation course. This 90min, 4k video will take you from A-Z and give you the tools you need to successfully navigate with you map and compass. https://www.mapandcom