References:

Countries:

 Bahrain - Belgium - Bulgaria - China - Denmark - Estonia - Finland

France - Germany - Greece - Holland - India - Indonesia - Canada

Croatia - Kuwait - Lithuania - Austria - Paraguay - Poland - Saudi Arabia

Sweden - Switzerland - Singapore - Slovenia - South Korea - Thailand

Turkey - Uruguay - USA - United Arab Emirates

Worldwide Users:

NATO & Militaries Worldwide - Railways

 Telecommunications - Weather Services - Fire Brigades / Rescue Organisations 

Photographies - Police - Broadcast / Television

Powerstations - Toll Collect - Enviromental Measurement 

Traffic Observation  - Waterways and Shipping Office