Before revision: Surface and near-surface navigation On the surface or at periscope depth, submarines have used these methods to fix their position: Satellite navigation: Global Satellite Navigation Systems (GNSS) — by entering waypoints internally, able to navigate at a more precise level.
After revision: Surface and near-surface navigation On the surface or at periscope depth, submarines have used these methods to fix their position: Satellite navigation: Global Navigation Satellite Systems (GNSS) — by entering waypoints internally, able to navigate at a more precise level.