GNSS has been used by land surveyors since the late 1980s, primarily for geodetic control networks and for photo control. Nowadays, GNSS is used to determine precise locations all over the globe, in any weather conditions and at any time of the day. GNSS geodetic surveying equipment has become smaller and easier to use being faster to use than other surveying methods. GNSS is specially used for large topographic surveys where a centimeter level accuracy is enough.
Sokkia GPS Survey Equipment
Spectra Precision is a sister company to Trimble and their main GPS receiver is called the Spectra Precision SP80 and it comes with 240 channels.