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Mission & Vision
Naval Oceanographic Office
Fleet Numerical Meteorology & Oceanography Center
United States Naval Observatory
News from the Naval Observatory
Earth Orientation Department
USNO Earth Orientation Products
Contents of Bulletin A
USNO GPS Products
GPS User Information
USNO VLBI-based Products
VLBI Correlator Data
VLBI-based Earth Orientation Parameters (EOP)
Earth Orientation Information Center
General Information about Earth Orientation
Frequently Asked Questions About Earth Orientation
What Is Earth Orientation?
What Is Polar Motion?
What does the Earth rotation coordinate measure?
What is the Celestial Pole Offset?
What is a Leap Second?
How do we measure Earth Orientation?
What causes variations in the Earth's orientation?
Who uses Earth orientation information?
Publications About Earth Orientation Products
Earth Orientation Software
Precise Time Department
The USNO Master Clock
The USNO Master Clock
Time Dissemination at the USNO
USNO Alternate Master Clock (AMC)
Cesium Atomic Clocks
Hydrogen Masers at the USNO
Rubidium Fountain Clocks
USNO Time Scales
International Time Scales and the BIPM
Definitions of Systems of Time
Global Positioning System
Global Positioning System Overview
USNO GPS Data Categories Explanation
CGGTTS Data Format
USNO GPS Time Transfer
GPS Information: SA, DGPS, Leap Seconds, etc.
GPS Week Number Rollover
GPS Timing Data and Information
USNO Format Explanation
USNO Computer Display Clocks
Two-Way Satellite Time Transfer (TWSTT)
Network Time Protocol (NTP)
US Eastern Time Zone NTP Servers
US Mountain Time Zone Servers
DoD Customer Servers
Astronomical Applications Department
Celestial Reference Frame Department
Senior Enlisted Advisor
Naval Oceanography Operations Command
Fleet Weather Center - Norfolk
Fleet Weather Center - San Diego
Joint Typhoon Warning Center
Public Use of Limitations
Naval Meteorology and Oceanography Command
Commander CHRISTOPHER K. TUGGLE
COMMANDING OFFICER NAVAL OCEANOGRAPHY ANTI-SUBMARINE WARFARE CENTER
14 June 2022
Commander Christopher K. Tuggle graduated from the University of South Alabama with a Bachelor of Science in Meteorology in December 2003. He earned his commission through Officer Candidate School graduating in April 2004 as a direct accession in to the Navy Meteorology and Oceanography community.
He holds master’s degrees in meteorology and physical oceanography from the Naval Postgraduate School and in national security studies from the Naval War College. He is a joint qualified officer.
At sea, he served aboard the USS NIMITZ (CVN 68) as the meteorologist and oceanographer where he earned his Surface Warfare Officer qualification and served as the Fleet Oceanographer for Commander, U.S. SEVENTH Fleet permanently embarked aboard USS BLUE RIDGE (LCC 19).
Ashore, he served as a military hydrographer at Fleet Survey Team ONE, Technical Special Reconnaissance Officer at Naval Special Warfare Support Activity ONE, Senior Meteorology and Oceanography Officer at United States Africa Command, and Operations Officer for the shore and afloat missions at Fleet Weather Center Norfolk.
CDR Tuggle assumed command of Naval Oceanography Anti-submarine Warfare Center Yokosuka, Japan in August 2021. Personal awards include the Defense Meritorious Service Medal, Meritorious Service Medal, Navy Commendation Medal, Navy Achievement Medal and various personal, unit and campaign awards.
Naval Oceanography Anti-Submarine Warfare Center
DoD Accessibility/Section 508
No Fear Act
Plain Writing Act
Veterans Crisis Line
DoD Safe Helpline
Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529
Official U.S. Navy Website