We Use Handheld GPS Receivers to Collect GCPs
||Instrument Specification:Brand: Garmin
Display: 2.2 inch Monochrome display
Use: Displays location, terrain, difficulty, hieghts and area description.
Battery: Powered By Two AA, 25 hour Battery life.
Additional features: Waterproof GPS, Easy to use, High sensitivity, WAAS enabled, Hotfix satellite,rediction, Worldwide Base Map, Paperless Geocaching.
||Instrument Specification:Brand: Trimble Juno SA
Physical Size: 12.9 cm × 7.4 cm × 3.0 cm (5.1 in × 2.9 in × 1.2 in) Weight: 0.23 kg (0.52 lb) with battery
Processor: 533 MHz Samsung S3C2443 processor
Memory: 128 MB RAM and 128 MB internal Flash storage
Battery: Internal 2600 mAh lithium-ion, rechargeable in unit
GPS Channels: 12 (L1 code only)
Integrated real-time: SBAS1
Update rate: 1 Hz
Time to first fix: 30 seconds (typical)
Accuracy (HRMS)4 after differential correction
Code Post processed: 1–3 m5
Real-time (SBAS1 ): 2–5 m
||Instrument Specification:Brand: Trimble R1
Sensor type: L1/G1 GNSS receiver and antennaSystems: GPS, GLONASS, Galileo, Beidou, QZSS
Channels: 44-channel, parallel tracking
Correction sources: SBAS, ViewPoint RTX, QZSS, VRS SBAS:4-channel, parallel tracking WAAS, EGNOS, MSAS GAGAN, SBAS ranging
Receiver Protocols: NMEA 0183 v4.00, Binary
Update rate: 1 Hz
Time to first fix: 45s typically
Reacquisition: < 2s
Real time correction protocols: CMR,CMR+,CMRx RTCM 2.1, 2.2, 2.3, 3.0, 3.1
SBAS accuracy1: <100 cm
Code DGNSS accuracy (VRS / RTK)1: 75cm + 1 ppm HRMS
ViewPoint RTX1: 50 cm
HRMS Maximum speed: 1,850 kph / 1,150 mph / 999 knots
Maximum altitude: 9,000 m (29,520 ft)
||A total station or TST (total station theodolite) is an electronic/optical instrument used in modern surveying and building construction. 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.