Naturally, tracking programs need accurate and recent data in order to generate accurate predictions. OIG now only has one public site on the Internet. Current specific elements can be obtained, but registered users are limited to 500 elements per 23 hours and 59 minutes for elsets not included in the OIG special interest groups. Historical TLEs can be requested by registered users. Registered users must log on at least once every 90 days to avoid losing access.
Registration provides the user with additional resources.
The OIG BBS is no longer in service. Private Resources There are private individuals and organizations not affiliated with government agencies that generate data on the Internet regarding Earth orbiting satellites. Mike McCants in the USA provides OIG's latest monthly Satellite Situation Report , updated elsets , as well as archived elsets . It can be found at Neil's UK site . Tristan Cools maintains a listing of satellites , including those with USA designations.