Intermediate circular orbit (ICO), also called medium earth orbit (MEO), is used by satellites between the altitudes of low earth orbit (up to 1400 km) and geostationary orbit (ca. 36,000 km). GPS uses a MEO satellite constellation.

Medium earth orbit communications systems

The Global Positioning System uses a MEO satellite constellation.

ICO Global Communications was the name of a proposed communications constellation for satellite telephony, originally developed by Inmarsat and spun off. In the wake of the financial failure of the Iridium satellite constellation, ICO also entered bankruptcy protection and delayed launching its satellites.

Another proposed system was Teledesic.

External links

• information on ICO - Lloyd's satellite constellations (http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/ico.html)
• official ICO website (http://www.ico.com/)