Nautical Calculators Free version : https://play.google.com/store/apps/details?id=com.vucongthe.naucal.plus - Calculating for marine navigation and maneuvering, included : +Route Plan; +Offline GPS Location +Rhumb-Line Sailing +Great-Circle Sailing +Meridional parts +Plane Sailing with Offline GPS Location +Traverse Sailing with Offline GPS Location +Meridional parts +Plane Sailing +Traverse Sailing +Current and wind sailing +Allowing for current and wind +Wheel Over +Calculate true wind and a