signals were corrupted because of the simultaneous receipt of many signals from the satellite footprint. In July 2009, SpaceQuest launched AprizeSat-3 and AprizeSat-4 with AIS receivers. These receivers were successfully able to receive the U.S. Coast Guard's SART test beacons off of Hawaii in 2010. In July 2010, SpaceQuest and exactEarth of Canada announced an arrangement whereby data from AprizeSat-3 and AprizeSat-4 would be incorporated into the exactEarth system and made available worldwide as part of their exactAIS(TM)service. On July 12, 2010, the Norwegian AISSat-1 satellite was successfully launched into polar orbit. The purpose of the satellite is to improve surveillance of maritime activities in the High North. AISSat-1 is a nano-satellite, measuring only 20×20×20 cm, with an AIS receiver made by Kongsberg Seatex. It weighs 6 kilograms and is shaped like a cube. On 20 April 2011, Indian Space Research Organisation launched Resourcesat-2 containing a S-AIS payload for monitoring maritime traffic in the Indian Ocean Search & Rescue (SAR) zone. AIS data is processed at National Remote Sensing Centre and archived at Indian Space Science Data Centre. On February 25, 2013—after one year launch delay—Aalborg University launched AAUSAT3. It is a 1U cubesat, weights 800 grams, solely developed by students from the Department of Electronic Systems. It carries two AIS receivers—a traditional and a SDR-based receiver. The project was proposed and sponsored by the Danish Maritime Safety Administration. It has been a huge success and has in the first 100 days downloaded more than 800,000 AIS messages and several 1 MHz raw samples of radio signals. It receives both AIS channels simultaneously and has received class A as well as class B messages. Cost including launch was less than €200,000. Canadian-based exactEarth's AIS satellite network provides global coverage using 8 satellites. Between January 2017 and January 2019, this network was significantly expanded through a partnership with L3Harris Corporation with 58 hosted payloads on the Iridium NEXT constellation. Additionally exactEarth is involved in the development of ABSEA technology which will enable its network to reliably detect a high proportion of Class B type messages, as well as Class A. ORBCOMM operates a global satellite network that includes 18 AIS-enabled satellites. ORBCOMM's OG2 (ORBCOMM Generation 2) satellites are equipped with an Automatic Identification System (AIS) payload to receive and report transmissions from AIS-equipped vessels for ship tracking and other maritime navigational and safety efforts, and download at ORBCOMM's sixteen existing earth