Before revision: However, its capability also included seafloor transponders, which in conjunction with early navigation satellites supported station keeping with a precision of about 300 feet, considered remarkable at the time.The Universe Below, Page 77, William J.
After revision: However, its capability also included seafloor transponders, which in conjunction with early navigation satellites supported station-keeping with a precision of about 300 feet, considered remarkable at the time.The Universe Below, Page 77, William J.