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Hand held GPS : In 2004 Garmin introduced its 60C line of handheld GPS mapping receivers, featuring increased sensitivity and storage capacity along with a battery life of up to 30 hours in battery-save mode. This was followed by the 60Cx and 60CSx with improved color map displays. The 60Cx and 60CSx have been used as primary navigational tools on several adventure and exploration trips to remote areas around the world

Deffrencial GPS : Differential Global Positioning System (DGPS) is an enhancement to Global Positioning System that provides improved location accuracy, from the 15-meter nominal GPS accuracy to about 10 cm in case of the best implementations. DGPS uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. These stations broadcast the difference between the measured satellite pseudoranges and actual (internally computed) pseudoranges, and receiver stations may correct their pseudoranges by the same amount. The digital correction signal is typically broadcast locally over ground-based transmitters of shorter range.

Total Stations (4): A total station is an electronic/optical instrument used in modern surveying. The total station is an electronic theodolite (transit) integrated with an electronic distance meter (EDM) to read slope distances from the instrument to a particular point

Technology of total station: 1. Coordinate Measurement, 2. Angle measurement, 3. Distance Measurement, 4. Data processing

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