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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
Lieutenant Commander Sabrina L. Cummings
Executive Officer, Strike Group Oceanography Team San Diego
15 June 2022
Lieutenant Commander Cummings is a native of Asheville, North Carolina and enlisted as an Aerographer’s Mate in the United States Navy in 1998. She completed her Recruit Training at RTC Great Lakes and reported to “AG-A1” school in Biloxi, MS. After graduating, she reported to Naval Atlantic Meteorology and Oceanography Detachment (NLMOD) New Orleans where she qualified as a surface weather observer, completed all AG-C1 school requirements and was promoted to Petty Officer Second Class.
In 2001, she reported to “AG-C1” school at Keesler AFB in Biloxi, MS. Upon graduation she was assigned to Mobile Environmental Team (MET) Norfolk where she qualified as Forecast Duty Officer (FDO) and completed deployments onboard USS THOMAS S. GATES (CG-51), USS COLE (DDG-67), USS MONTEREY (CG-61), USS MAHAN (DDG-72), and USS VELLA GULF (CG-72) and was selected for First Class Petty Officer. In 2003 she deployed to Guantanamo Bay Cuba in support of Operation ENDURING FREEDOM.
In 2004 LCDR Cummings was selected for participation in the Seaman To Admiral -21 (STA-21) program and reported to Officer Training Command in Newport Rhode Island. In 2008 she graduated from Old Dominion University with a Bachelor of Science in Physics and was commissioned as an Ensign. She reported to Pensacola Florida for initial flight training, eventually earning her wings as an E-2C Hawkeye Naval Flight Officer. LCDR Cummings returned to the Naval Oceanography community in 2012 and served as a Command Duty Officer at Fleet Weather Center (FWC) Norfolk. She served as the Officer-in-Charge of the Naval Oceanography ASW Detachment (NOAD) Jacksonville from 2013 to 2015. In 2018 she earned her Master of Science in Meteorology and Physical Oceanography from the Naval Postgraduate School and reported onboard USS BOXER (LHD-4) as the METOC officer, where she completed their 2019 WESTPAC deployment. In 2020 she reported to Strike Group Oceanography Team San Diego (SGOT-SD) as the Executive Officer.
LCDR Cummings has been awarded the Navy Commendation medal, Navy Achievement Medal (four awards), and various campaign and unit decorations.
LCDR Cummings is married to Chief Aviation Machinist Mate Gerard Cummings and they have two daughters, Taylor (20) and Jordan (6).
Strike Group Oceanography Team San Diego
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Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529
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