Founded in 1989, GPS World is the first and only international monthly journal that features news and applications of the Global Positioning System, GLONASS, and related technologies. GPS World Newsletter, published twice a month, offers news reportage and analysis of business and technology developments, marketing trends, and policy issues affecting the GPS community.

Geodetic Datum Overview

Global Positioning System Overview

Map Projection Overview

GSM World - the world wide web site of the GSM Association.

GSM Info Online provides detailed information about GSM network operators worldwide. Details include network, roaming, services and coverage information for over 300 operators in 142 countries/areas of the world.

http://www.gsmworld.com/gsminfo/gsminfo.

Светофор

Правила дорожного движения ЛР. Теория, учения, тесты

http://www.svetofor.lv/