psiexams.com
Unmanned Aircraft Systems (UAS) Drone Knowledge Test

SpaceWeather.com
News and information about meteor showers, solar flares, auroras, and near-Earth asteroids.

GPS – Schriever Air Force Base
Operated by the dedicated men and woman of the 2nd Space Operations Squadron at Schriever Air Force Base, Colorado. GPS is also the world’s largest military satellite constellation.

CORS – National Geodetic Survey – NOAA
The National Geodetic Survey (NGS), an office of NOAA’s National Ocean Service, manages a network of Continuously Operating Reference Stations (CORS) that provide Global Navigation Satellite System (GNSS) data consisting of carrier phase and code range measurements in support of three-dimensional positioning, meteorology, space weather, and geophysical applications throughout the United States, its territories, and a few foreign countries.

OPUS – National Geodetic Survey – NOAA
NGS provides the framework for all positioning activities in the Nation. The foundational elements – latitude, longitude, elevation, shoreline information and their changes over time – contribute to informed decision making and impact a wide range of important activities including mapping and charting, navigation, flood risk determination, transportation, land use and ecosystem management.

FAA Website
The FAA is primarily responsible for the advancement, safety and regulation of civil aviation. They also publish regulations regarding drones and their use.

senseFly
The industry leader in mapping drones, senseFly provides customers in fields such as surveying, agriculture, GIS, industrial inspection, mining and humanitarian aid with safe, ultra-light and easy to use data collection tools.

Topcon
Topcon offers a variety of surveying instruments and equipment.