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NGS (National Geodetic Survey)
Cartography, surveying, mapping, including CORS, ephemeris, orbital data and much more

NOAA (National Oceanographic and Atmospheric Administration)

USNO (United States Naval Observatory)

NASA (National Aeronautics and Space Administration)

ESA (European Space Agency)

U.S. Air Force

U.S. Navy

U.S. Marine Corps

U.S. Coast Guard 

USGS (United States Geological Survey)

Ask the USGS

CIA (Central Intelligence Agency)

FEMA (Federal Emergency Management Administration)

FCC (Federal Communications Commission)

National Geospatial-Intelligence Agency
Formerly NIMA (National Imagery and Mapping Agency)
Formerly called DMA (Defense Mapping Agency)

NATO (North Atlantic Treaty Organization)

NAWCWPNS (Naval Air Warfare Center Weapons Division)

The White House

FAA-GPS

National Space-Based Positioning, Navigation and Timing Exectutive Committee
Replaces the Interagency GPS Executive Board (IGEB)

NDGPS home USCG Navigation Center DGPS

NHTSA - National Highway Traffic Safety Administration

Planetary & Solar Related Sites

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The Space Environment Center, NOAA
Monitors and forecasts solar and geophysical activity conditions that are known to have an impact on GPS.

Sun Spot Information
Sun Spot News, Stories and updates from NOAA

Planets and the Solar System - 9 8 Planets!
Another excellent site which has more content than can be listed here. A lot of real time info. Tours of the solar system. The Sun, planets asteroids and comets.

Weather and Atmosphere Related Sites

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AccuWeather

ESOC Ionosphere Plots

Ionosphere

Weather Bug

Solar Max

The Sunspot Cycle

NASA Sunspot Chart

The Sun-Earth Connection Education Forum

Space Weather Bureau

Space Related Sites, Satellite Launch Schedules and Information

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Space Calendar
Excellent launch schedules and daily celestial events with special features and archives. From NASA and the Jet Propulsion Lab.

Launch Schedules & Future Launch Systems
Shuttle and other launch schedules. Experimental vehicles.

NASA Today
NASA up-to-date headlines

Space On-line
By Florida Today newspaper. Great site for news, launch schedules at various launch sites. Links to other space related sites.

The Satellite’ s Encyclopedia
Encyclopedia of over 1700 satellites. complete with fact sheets containing basic info. on satellites.

Spaceflight Now News and information on space vehicles and launches. Very up to date and cool site.

Satellite Navigation Positioning Lab

Tracking & Prediction On-line

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Interactive GPS & GLONASS Satellite Prediction

GPS Satellite Almanacs and SEM Program ARINC

Status page
GPS constellation status - Schriever AFB

Satellite Tracking - From Heavens Above .com

Satellite Tracking - From Moving Satellites .com

Surveying , Geodesy, Geographics and Geography

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USGS (U.S. Geodetic Survey)
NGS (National Geodetic Survey)
http://www.ngs.noaa.gov
A part of NOAA this site combines a lot of information and links related to cartography, surveying, mapping, including CORS, ephemeris, orbital data and much more. This site has a lot to offer.

GPS Precise Orbit Data
From NGS and NOAA, accurate and timely GPS satellite ephemeride data.

Coordinate Transform Page

How to Read the Universal Transverse Mercator (UTM) Grid

University of Calgary - For general informaion
Department of Geomatics Engineering. One of Canada’ s foremost educational institutions on GPS for Geomatics Engineering. Information on KIS  conferences. For the PLAN Research Group  (Position Location and Navigation)

University of New Brunswick
One of Canada’ s foremost educational institutions on GPS for Geomatics Engineering. Very complete, detailed site down to the photo album.

Geodesy and Geomatics Hotlinks
Too many to list. International links.

The Geographer’ s Craft
The Univ. of Colorado at Boulder. Full course including lecture notes, lab exercises & glossary

U.S. GeoData
GIS, Software, SDTS, DEM and much more. USGS

Ordinance Survey
Great Britain’ s national mapping agency which covers the production, maintenance and marketing of a range of maps (digital and paper) and other related information.

ACSM (American Congress on Surveying and Mapping)
A professional organization representing those who communicate the Earth’ s spatial info. using precisely prepared plats, charts, maps and digital cartographic and related data systems.
List of Links compiled by ACSM - American Congress on Surveying and Mapping.

Land Surveying and Geomatics
Geomatics Resources with a specialization in land surveying.

Geography Guide at The Mining Company                                                                                         
Very cool site for basic geography and geodesy. Also a lot of " to do" links and information sites.                   

On-Line Resources for Surveying and Geomatics

Access to and Manipulation of NGS CORS Data

Benchmark locator by NGS

Coordinates
CORS coordinates

CORS Data

GIS

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GEO Community Web Site
The GeoCommunity Web site is the premier resource for GIS/CAD professionals. It's a must visit for FREE downloads from over a terabyte of geospatial datasets, a high-powered, industry-specific search engine, GIS industry news, discussion forums, classifieds, and software utilities.

Stanford University
Digital GIS data and information. Links to other GIS sites                                                                                                                                                                                                                                                                                                                                                                                                                       

Earth Observations and Data

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NOAA (National Oceanographic and Atmospheric Administration)
Many useful sites, services and software for weather, marine, atmospheric and earth based services

NOS (National Ocean Service)
A part of NOAA which primarily deals with U.S. coastal and oceanic environment.

NEOS (National Earth Orientation Service)
Coordinates, collects, analyzes, and distributes data from various operational U.S. programs that monitor variations in the orientation of the Earth.

NGDC (National Geophysical Data Center)
NOAA provides DMSP sat. data, Glaciology, marine geo. & geophysics, solid Earth Geophysics and much more.

National Geomagnetism Program
Monitors and predicts the Earth’ s magnetic field throughout Canada

EarthExplorer USG

Associations, Organizations and Educational Institutions

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Institute of Navigation
Professional society dedicated to the advancement of the art and science of navigation. Hosts 3 meetings a year including the worlds largest GPS meeting, ION-GPS.  Also hosts Navtech Seminars GPS tutorials.

Royal Institute of Navigation
United Kingdom's Royal Institute Of Navigation (RIN) is a professional society whose objectives are to unite in one body those who are concerned with or who are interested in navigation and to further its development.

International GNSS Service (IGS) - along with a multinational membership of organizations and agencies, provides GPS orbits, tracking data, and other high-quality GPS data.

University of Calgary
Department of Geomatics Engineering.
One of Canada’ s foremost educational institutions on GPS for Geomatics Engineering. Information on KIS conferences.

University of New Brunswick
One of Canada’ s foremost educational institutions on GPS for Geomatics Engineering. Very complete, detailed site down to the photo album.

Industry and Non-Profit Organizations
This extensive site by John Beadles is being revised, links to the exact documents will be posted later. Too much to list.

Oddens’ s Bookmarks
More maps and mapping related data than you will ever know what to do with. A must for mapping applications.

GESS  George Mason University (Department of Geography and Earth Systems Science) 
Many mapping applications, maps and projects

Ordinance Survey
Great Britain’ s national mapping agency which covers the production, maintenance and marketing of a range of maps (digital and paper) and other related information.

AIAA (American Institute of Aeronautics and Astronautics)
The world’ s leading professional society in the broad areas of aeronautics and astronautics.

IEEE (Institute of Electrical and Electronics Engineers)
Advancing the theory and practice of electrical, electronics and computer engineering and computer science.

UNAVCO - The University NAVSTAR Consortium. Supporting research into earth processes via high precision geodesy with GPS.

Galileo - Information site for the European Union project

The Canadian Coast Guard Home Page

The Radio Technical Commission For Maritime Services

Timing

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USNO United States Naval Observatory

USNO (U.S. Naval Observatory)
USNO master clock, computer time services, world time zones, satellite time transfer, PTTI, sun/moon rise etc. and much more.

USNO GPS Data & Information
USNO timing related to GPS. Other GPS related data as well.

GPS Time Series
Variety of GPS time based references.

Systems of Time
An explanation of different times and time references includes MJD current time.

Time Synchronization Software
Wide variety of timing software for UNIX, DOS, Win 3.x, 95, NT, Netware, Mac, OS2, Netscape, Java and wristwatch platforms. Includes network adjustment software. Too much to list.

NIST Network Time Service

On-Line Interactive Map and Mapping-Related Programs, Plus Other Real-Time Programs

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Latitude/Longitude Look-up

Earth Viewer
View a map of the Earth observing day and night regions from such vantage points as the sun, moon or Earth itself.

BigBook
Search for phone numbers and you can also pull up maps searching by exact street address or zip code.

Map Quest
Interactive mapping program which will allow display of points of interests as well al your requested location on a map.

GIS Date Depot

Coordinate data sheets

Industry

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Lockheed Martin - Information on the Block IIR Satellite

Boeing - Great Information and images on the Block IIF Satellites.

Fiber Optic Cables - Timbercon - Manufacturer of fiber optic cables and custom fiber optic solutions for any industry or application.

Miscellaneous

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Inside GNSS Magazine
A fresh perspective in to the GNSS industry including GPS, GLONASS and Galileo. 

GPS World Magazine
Monthly GPS magazine dedicated to GPS and related fields.

Kalman filter links
http://www.cs.unc.edu/~welch/kalmanLinks.htm

JPL (Jet Propulsion Laboratory)

FGCS-Selective Availability Removal plots

Big Yellow
Search for Business phone numbers, www pages, e-mail addresses, residence phone numbers for the United States. Forget “ 411” .