N71 GNSS Sensor

Advanced and Durable

Designed for seamless integration, the CHC N71 is a powerful multi-application GNSS sensor which delivers state-of-the-art positioning featured in a rugged enclosure.

The N71 provides a cost-effective answer to demanding applications such as geodetic reference station, academic research, precision agriculture RTK network, deformation monitoring, centimetre accuracy RTK sensor for marine survey, dredging or any GPS/GNSS machine guidance when high performance and reliability are required.


Outstanding GNSS Performances

The N71 offers outstanding performances with proven and innovative GNSS functionality. The future proof multi-constellation tracking feature increases availability in obstructed sky conditions such as construction sites in urban areas while securing RTK accuracy. The very low noise GNSS carrier phase measurement and low level elevation tracking technology make the N71 a powerful reference station solution.

  • 220 channel GNSS Core (Trimble Maxwell)
  • Ethernet, Serial and USB support
  • Convenient HTTP interface and configuration
  • Multiple data formats
  • Powerful remote configuration and access
  • Ultra-rugged case with multiple mounting option

GNSS characteristics

  • 220 channel satellite tracking
    • GPS: L1C/A, L2C, L2E, L5
    • GLONASS: L1C/A, L1P, L2C/A, L2P, L3
    • Galileo: E1, E5A, E5B (test)
    • BeiDou: B1, B2 (optional)
  • Advanced multipath mitigation technology
  • Low noise carrier phase measurement with <1 mm precision in a 1 Hz bandwidth

Performance specifications*

  • Real Time Kinematic (RTK)
    • Horizontal: 8mm + 1ppm RMS
    • Vertical: 15mm + 1ppm RMS
    • Initialization time: typically < 10s
    • Initialization reliability: typically >99.9%
  • Post Processing (Static)
    • Horizontal: 3mm + 0.5ppm RMS
    • Vertical: 5mm + 0.5ppm RMS
    • Baseline Length: ≤300km


  • 1x LAN port:
    • Tx Rate – 1 port with RJ45 connector supports links to 10BaseT/100BaseT networks
    • HTTP, HTTPS, TCP/IP, UDP, FTP, NTRIP Caster, NTRIP Server, NTRIP Client
    • Proxy server support
    • Routing table support
    • NTP Server, NTP Client support
    • UPnP and Zeroconf support
    • Email Alerts and Position Monitoring
  • 1x Lemo 10 pin 1 shell, 3 wire serial with power input, 1x USB 4 wire
  • Optional internal GPRS modem: – Quad-band international modem with SMA antenna connector

Optional radio modems**

  • External Pacific Crest ADL Vantage Rx/Tx:
    • Tx Rate: 0.5W – 4.0W adjustable.
    • Range: up to 15km
  • Internal Rx (options):
    • 410-430 / 430-450 / 450-470 MHz
  • Protocols:
    • Correction formats; RTCM2.1, RTCM2.3, RTCM3.0, CMR+, CMR
    • Position/Status I/O: NMEA0183 v2.30, GSOF
    • Observables: RT17, RT27, BINEX, RTCM 3.x
    • Up to 50 Hz output standard


  • Internal data logging storage capacity: 64Mb upgradable to 4Gb (optional)


  • Size (LxWxH): 195 x 145 x 51 mm
  • (7.7 x 5.7 x 2.0 in)
  • Weight: 1.35 kg (48 oz)
  • Operating temperature: -30 °C to +65 °C
  • (-22°F to 149°F)
  • Storage temperature: -40 °C to +75°C
  • (-40°F to 167°F)
  • Humidity: 100% condensation
  • Waterproof and dust proof: IP65 and MIL-STD 810F
  • Shock: survives a 1.5-meter drop on to concrete


  • Power consumption: 2.6 W nominal, dependent on user settings
  • External power input: 9-18 VDC

User Interface

  • PC Control Utility via Serial
    • Allows for advance receiver setup of UHF, GPRS Modem, data logging
  • Web User Interface
    • Secure
    • Allows remote configuration, data retrieval and firmware updates
    • Setup of multiple streaming / monitoring ports

Antenna option

  • A220GR GNSS Geodetic Antenna and C220GR GNSS Choke Ring Antenna
* Accuracy and reliability specifications may be affected by multi-path, satellite geometry and atmospheric conditions. Performances assume minimum of 5 satellites, using recommended general GNSS sensor practices.
** UHF type approvals are country specific.
*** Specifications are subject to change without notice. All trademarks are the property of their respective owners.