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  X91+Satel and i80 Single Head Kits

Use a Single Head Kit as:
  • Network Rover: use as a Network Rover

  • UHF Base: add a Base to an existing Network Rover for use when cellular connections are not available.

  • 2nd Rover: add a second rover to an existing Base-Rover pair.

The same head, engine, UHF radio as the 'All-in-One' Pairs:

  • RTK GNSS Receiver, with internal 1-watt Satel Transmit/Receive 400 MHz UHF radios, GSM Cellular Modems, batteries, chargers, antennas and download cables.

  • Use your own data collector or purchase one of our data collector kits which include brackets and Carlson SurvCE field software.

  • Trimble BD-970 220-Channel, 4-constellation GPS+GLO+GAL+BDU, fully enabled GNSS engines.

  • Fully provisioned: optioned for all constellations and all operation modes (UHF, Network and DCI.) There are no ‘after-sale’ options.

  • Internal Satel 1-watt UHF Transmit / Receive Radio (403 MHz - 473 MHz.)

  • Network Ready: Internal GSM Modem or Internet via Data Collector (DCI.)

  • Large ground-plane geodetic antenna offers low angle tracking with near choke-ring performance.

  • 4-GB Internal Memory: stores 250+ days of 5-second interval observation data, emulates a USB External Drive for easy file downloads, simple 1-button data record or program for automatic collection.

  • Direct submission to OPUS Static, RS and Projects with the included iGage X9x Download tool.

  • Cable free field operation.

  • Rugged, Submersible, IP67.

  • 2-year warranty on GPS receivers.

  • Eligible for iGage 10-24 same as cash financing / lease.

Complete Single Head kits include everything needed to survey as a Network Rover except for:
   o Range pole
   o Data Collector  [ Standard Data Collectors ]
   o a subscription to your local network [ more... ]
   o internet access [ more... ]


X91+ $ 6,532 single head complete
i80 $ 8,020 single i80 head complete
  [ more i80 information ]

Prices include ground shipping to USA addresses. iGage 10-24, same as cash financing available (OAC.)

  Included Accessories
Download Cable
Tuned UHF Antenna
Dual-Charger with Power Supply
Printed User-Manuals
Hard case.

Single Head Model


Price (MSRP)5

$ 6,532 single head complete

GNSS Engine

Trimble BD-970


220 Channels, 4 constellations

 GPS: L1C/A, L1C, L2C, L2E, L5



 Galileo: E1, E5A, E5B (test)

 BeiDou: B1, B2

 5-hz rate

RTK Performance1

Horz         8 mm + 1 ppm RMS

Vert         15 mm + 1 ppm RMS

Static Performance1

Horz         3 mm + 0.5 ppm RMS
Vert         5 mm + 0.5 ppm RMS


< 10 seconds, 99.9% reliability


RTCM 2.3, RTCM 3.0, CMR, CMR+, sCMR, NMEA 0183
HCN output for GNSS raw data


Base and Rover All-in-One receivers are identical and can be used as two Network Rovers. Data Collector Internet, Wi-Fi via Data Collector Internet and Internal GSM modems allow for NTRIP and DIP connections.


1x RS232 serial port; 1x USB

Integrated Bluetooth® Class 2

Integrated GSM/GPRS modem

Internal Satel Transmit / Receive UHF: 403-473 MHz; Trimtalk, EOTT, SATEL



Size (LxWxH): 7.5 x 7.9 x 3.3 in (190 x 200 x 84 mm)

Weight: 3 lbs. 1 oz. (1.4 kg) with battery
Operating temperature: -40°F to 149°F (-40°C to +65 °C)
Storage temperature: -40°F to 167°F (-40°C to +75°C)

Humidity: 100% condensation

Waterproof and dust proof: IP67 protected from temporary, immersion to depth of 1-meter, floats

Shock: survives a 2-meter drop to concrete


Power consumption: 2.6 watts as a rover
Lithium-Ion battery capacity: 2.2 Ah, 7.4 V, accepts 2.6 Ah extended

Battery Life2: Up to 6-hours typical, 1,000 charge cycles

External power input accepts 9 to 18 VDC

Communication: 10-pin Lemo
  USB: GPS Device mounts as an external drive
  Serial: RS232 Communications and Configuration Port

Internal Storage

4-GB Flash. Over 50-days storage at 1 Hz, 2-years with 5-second epochs3

Data Collection Software

Carlson SurvCE, SurvPC; MicroSurvey FieldGenius


2-year iGage warranty; 2-year CHC factory warranty; accessories 1-year; batteries 90-days

The Fine Print

1 Precision and performance values assume a minimum of 9-satellites in multipath clear, EMI free, obstruction free environment with reasonable atmospheric conditions and satellite geometry. Network based solutions based on shortest actual baseline. Post-processed accuracy is dependent on baseline length and time-on-point, 24-hour observations may be required. Stable mounts and generally accepted survey practices are required for the highest order survey results.

2 Battery life varies with temperature and battery age. An external power source is recommended for static occupations lasting longer than 4-hours and base operation longer than 2 hours. Elevated and extreme cold working or storage temperatures (> 85°F, <-20°F) hasten capacity loss.
3 Assuming 14-tracked satellites.

4 Initialization times assume reasonable baseline, constellation and number of SV’s in a multipath and obstruction clear environment.

5 GPS Receiver price includes Ground Shipping to most USA address.

Prices, specifications and descriptions are subject to change without notice. Please call us for the latest information and a custom quotation.

OAC: On Approved Credit, see [ iGage 10-24 ] for details.

A FCC license is required for UHF Base operation. A FCC license is not required for UHF or Network Rover operation.


Network Subscription

A source of network corrections is required to use a Network RTK rover. There are many common types of network corrections sources in the United States:

  1. Single Baseline (like the UNAVCO PBO and CRTN)
  2. Trimble VRS network solutions
  3. Geo++ network solutions
  4. Leica Spyder network solutions
  5. Topcon TopNet network solutions
  6. Private single baseline bases, like those based on the CHC N71 hardware

CHC receivers will work great with any of these systems. Best performance is obtained from a network that includes GLONASS corrections. Single baseline corrections should be less than 40 KM (24.8 miles) from your work area. Accuracy decreases 0.010 meters per 10 KM of baseline (1 part-per-million.)

Network solutions (like VRS) should have reasonable base spacing. Generally the further your project is from a physical base, the worse the expected accuracy. Elevation accuracy suffers more than horizontal accuracy for long baselines. All RTK rovers become unproductive when the effective baseline is large. Adding GLONASS corrections substantially decreases the time to fix, the ability to hold a fix when moving and allows surveying when the GPS satellite count is low.

For a recent list of available systems in the United States, check out Eric Gakstatter's January 2014 article "Finally, A List of Public RTK Base Stations in the U.S."

Pricing for network access varies from free to $300 per month. If existing network GPS infrastructure is unavailable, it is possible to deploy a network base for under $8,000, checkout our [ N71 Reference Station .]


Internet Access

A reliable source of internet connectivity is required for a network rover. Connectivity on CHC receivers is typically provided by one of three methods:

  1. GSM (ATT or TMobile) SIM card in head
  2. GSM (ATT or TMobile) SIM card in data collector
  3. WiFi connection from data collector to wireless hotspot (Any Carrier's Mi-Fi or a phone's hotspot)

For a variety of reasons, method #3 is typically the best.

Advantages of Using Mi-Fi to Data Collector Method

  1. Debugging the connection: With Mi-Fi You can see the status of your internet connection on the Mi-Fi screen:
    With a glance, you know your MiFi device is online and you know the signal strength.
  2. You can use the 'Internet Explorer' on the LT-30 to check internet connectivity.
  3. The Wi-Fi connection from a LT-30 to the MiFi is bullet-proof. It just happens and it works every time.
  4. You can get a Mi-Fi device from Verizon (or any other carrier) for use where ATT and T-Mobile have no service!
  5. Typically the price for a Mi-Fi subscription is lower than a sim card.
  6. As new technologies become available (like 4G-LTE) you can replace the Mi-Fi and enjoy them.
  7. You can use the Mi-Fi with other devices (tablet, laptop, multiple rovers), leveraging the internet service investment.
  8. The data rate connection is way faster with a Mi-Fi. In the Salt Lake market, an ATT Mi-Fi has a 4GLTE connection rate of 25 Megabytes per second. The internal modems are typically limited to 3G connections.
  9. My cell phone does ‘data roaming’ in South West Wyoming. But my Mi-Fi does not (I do not understand why.) So my MiFi gets unlimited roaming data but my phone does not. By connecting my phone to the MiFi I can minimize my roaming data.
  10. In some states (like Utah) there is no tax appended to the Mi-Fi bill.
  11. If you use your phone hotspot and it does not support simultaneous voice and hotspot, then your RTK receiver will go offline and loose fix while you talk on your phone.
  12. If cell phone service is spotty, you can put the Mi-Fi on the top of a prism pole to increase it's cellular range.

Disadvantages of Using a SIM Card in a Rover’s Internal Modem

  1. Once you make a connection, you can’t read the signal strength of your connection.
  2. Entering all the APN passwords, user names, server names is a pain.
  3. The data collector and GPS internal modems do not support 4G and 4G-LTE connections.
  4. The data collector and GPS internal modems do not support CDMA (Verizon) connections.
  5. The sim card can only be used with one device at a time.

iGage Mapping Corporation
1545 South 1100 East STE 1, Salt Lake City UT 84105 USA

Voice: +1-801-412-0011 · Toll Free: +1-888-450-4922
Fax: +1-801-412-0022 
· Toll Free: +1-888-450-4983

email: orders@igage.com · General iGage Information

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