The GRS-1 addresses real-time GIS mapping and data exchange as it incorporates an optional internal GSM or CDMA modem into the handheld device. Use the internal modem to dial up to a reference station network for real-time correction data or to access a GIS server in the field.
Visit the link below for more information
http://www.positionpartners.com.au/products/geodetic-receivers/
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