Advanced Notification of Future GPS Leap Second

Yesterday, 18 July, the Air Force entered, into the GPS MCS, a Future Leap Second to become effective on 31 December 2016. As Navigation Uploads are/were performed over the following ~24 hours, GPS satellites will, one at a time, begin broadcasting this Future Leap Second, along with its date of effectivity and the Current Leap Second count, in accordance with IS-GPS-200. When specific satellites will begin broadcasting the new information will depend on the contact schedule over the next ~24 hours, which is dynamic and subject to real-time operations. When specific users will begin seeing the new information will depend on a number of factors, including satellite visibility and user equipment design.