Here are links to other web sites which you may find useful.

American National Standards Institute - Home Page

British Standards Institution - Home Page
Updated daily. Just to show that we have a sense of humour!
European Space Agency European Space Agency
European Telecommunications Standards Institute -
You can download relevant standards from this site.
Galileo Galileo European Satellite Navigation System
International Telecommunications Union - You can download relevant standards from this site.
Knowledge Transfer Network
National Institute of Standards and Technology - Workshop on Synchronisation in Telecommunication Systems.
The National Physical Laboratory run the Time and Frequency User Group in the UK.

Ofcom is the regulator for the UK communications industries, with responsibilities across television, radio, telecommunications and wireless communications services.
The Russian Federation Information Centre - GLONASS information.
WORLDTIME® is a service featuring an interactive world atlas, information on local time, as well as sunrise and sunset times in several hundred cities, and a database of public holidays worldwide.
United Kingdom Accreditation Service UKAS is the UK’s National Accreditation Body, responsible for determining, in the public interest, the technical competence and integrity of organisations such as those offering testing, calibration and certification services
US Coastguard Navigation Centre
Time Service Department of the US Naval Observatory. Good info on GPS plus time of day.