The Forester's Choice for 
GPS Surveying Under a Canopy

The choice for foresters. Works well under tree canopy. Includes the industry's only built-in TRAVERSE function to let you collect positional data even when GPS signals are not available, such as in extremely dense canopy situations or in caves.

The rugged MC-GPS has been in the market for over six years. Thousands of units are utilized in rough forest terrain.

A proven and reliable GPS unit for GIS applications.

MC-GPS is the solution of choice for some of the most demanding GPS professionals in the business, including:

- U.S. Forest Service
- The Nature Conservancy
- The Timber Company
- Bureau of Land Management
- U.S. National Park Service
- Bureau of Indian Affairs
- Weyerhaeuser
- Georgia Pacific
- International Paper

Let CMT's MC-GPS provide you with the same reliability and ruggedness that the pros have come to depend on.




















List Price:





GPS receiver:

6 channel

6 channel



DGPS Beacon Receiver:





Professional GPS/GIS:





Mapping Accuracy:
(Differentially Corrected, 2DRMS)

C/A Code:  1 - 3 meters
   Carrier Phase:   2.5 cm + 2 ppm (optional)



Designed for easy use:

Yes, CMT Field 3.8 Included



On-board Traverse:





Post Processing:






 3 MB standard
   5 MB and 8 MB optional

 3 MB standard
   5 MB and 8 MB optional



Records Points, 
Lines, and Areas:





GPS/GIS Mapping Software:
Microsoft Windows® based 

Yes, PC-GPS 05 Included




Yes, submersible

Yes, submersible



       Audible beeper signal:










System Features
- 6-channel L1 frequency
- Full wavelength carrier phase on L1
- Carrier-phase smoothing
- Up to 1 Hz position update rate
- Up to 1 Hz code & phase measurements
- 1 PPS timing signal
- Superior performance under tree canopy

NMEA / Barcode Device Interface Capabilities
- Two 9-pin RS-232 serial ports, PC/AT pinout.
- The MC-GPS has two waterproof DB-9 RS-232 serial ports (COM1: and COM2:) for communication with your PC as well as a variety of additional input and output devices such as:

RTCM-104 Version 2.0: Real-time DGPS 
Simply plug your RTCM-104 source (i.e.FM pager, VHF radio, WADGPS) into the MC-GPS's COM1: port. The MC-GPS will automatically detect and use the RTCM message. Since the MC-GPS has two DB-9 serial ports, you can use COM1: for RTCM and still have COM2: available for a barcode reader or NMEA output to another instrument. Don't worry if you lose the RTCM message while you are collecting data; the MC-GPS can be set to collect raw data and will automatically warn you so you can post-process your data.

Compatible with Coast Guard Beacon Receiver  
Obtain real-time differential correction with CMT's Coast Guard Beacon Receiver package.

NMEA 0183 output 
The MC-GPS will send out a NMEA 0183 message, at an interval specified by you, to either COM1: or COM2:. This functionality allows the MC-GPS to output a GPS position to devices (i.e. digital cameras, sonar, etc.) that will accept a NMEA 0183 message. There is no need to change your instrument settings. The MC-GPS communications can be set to match your instrument. In the NMEA Setup screen, you have complete control over the baud rate and protocol settings.

Efficient Data Entry with Bar Code Input  
Attach a bar code scanner to the MC-GPS and you can quickly enter data. Bar code menus can be set up in such a way that you never need to touch the MC-GPS keyboard.

Data Collector Features
- Waterproof (submersible)
- Audible beeper
- Operating temperature: -40°C to 54°C
- 8 line x  21 character backlit display
- 3 MB RAM standard (5 MB, 8 MB optional)
- Fully integrated GPS receiver, antenna and data collector in one hand-held unit
- 55-key alphanumeric keyboard including 5 function keys and separate numeric keypad
- Optional external antenna
- Rechargeable battery

CMT Field Software v3.8
- Collect Points, Lines Areas
- Feature/Attribute/Value GIS structure
- Graphic plotting.
- Traversing - keyboard data entry to allow you to continue mapping when GPS is obstructed
- Offset function to map hard-to-reach locations.
- Nested point function for tagging points while you are mapping a Line or Area Feature.
- Averaging function to optimize accuracy while recording static points.
- LLA/UTM/SPC plus user-defined coordinates.
- Supports 50 datums plus user-defined datums.
- Provides area calculation in the field
- Interfaces to laser rangefinders, barcode readers and various NMEA devices
- Canyon, Blockage and Clear modes for optimal tracking performance

Obtain 2 cm + 2 ppm accuracy with Carrier Phase
Using the carrier phase option, the MC-GPS-CM can attain centimeter-level accuracy (2cm+2ppm) without separate data collectors, antennas or poles. Uploading and processing your carrier phase data in PC-GPS is virtually the same as processing C/A code data. Behind the scenes, however, is a robust carrier phase processor (CMTCM) that will provide either a FIXED solution (ambiguities fixed to integers) or FLOAT solution (ambiguities resolved to real values). The program will notify you of which type of solution was used. You may also process the same data with the standard C/A code processor by simply selecting the CMT Differential processor.

The MC-GPS-CM offers the ultimate in flexibility, allowing you to do a variety of tasks. It can be used to record 1-3 meter data in addition to 2cm+2ppm data. For example, if you have a job that requires 2cm+2ppm accuracy on the property corners but only requires 1-3 meter accuracy on the streams running through the property, the MC-GPS would be the perfect tool. It can perform both tasks in the field without skipping a beat. In the past, you would have needed two different types of GPS receivers to do this job.

The MC-GPS package includes CMT's PC-GPS software for comprehensive GPS project management and mapping. PC-GPS provides functions for Mapping, Mission Planning, Batch Differential Correction, Static Point "Spread" analysis and Job Editing. The software also supports GIS layering, raster images (i.e. DOQs, DRGs, aerial photographs, satellite imagery), multimedia objects (OLE 2.0) and Microsoft® ODBC.

System Accuracy Specifications

Real-Time Differential (DGPS):


2.5 m

DGPS (typical)

1 - 3 m



L1 Carrier Phase Post-Processing:

Static (RMS)

2.5 cm + 1ppm

Static Spread (typical) 

2 cm + 2ppm



L1 C/A Code Post-Processing:

Static (RMS)

2.5 m

Static (typical)

0.9 m - 1.5 m

Time to first fix

60 sec. typical, 40 sec. with
current ephemeris

Drop lock sensitivity

-143 dBm costas threshold

Acquisition sensitivity

-134 dBm costas threshold


< 1 sec with < 10 sec interruption

Velocity (RMS)

.05 m/sec.

Maximum velocity

460 m/sec.

Maximum altitude 

18,000 m

Maximum acceleration



MC-GPS Specifications


Year 2000 Compliant

Operating System:



CMOS 8088, no memory wait states, operating at 10 MHz

System Memory:

512Kb RAM

RAM Disk:

3 MB internal standard. Optional 5 and 8 MB available.


Waterproof, dustproof, shock-resistant

Operating Temp.:

-40°C to 54°C


8 lines x 21 characters (8192 pixel graphics)


Two 9-pin RS-232 serial ports (PC-AT Pin-out)
Baud rate configurable from 300-38400 bps


55-key, alphanumeric, tactile keyboard
with large numeric pad and 10 function keys (5 shifted).


12.35" x 4.06" x 2.3"


3 lbs (48 ounces) including batteries and attached antenna.


Without DGPS: 0.1 m/s With DGPS: 0.05 m/s


Without SA: 1 pps +/- 50 ns RMS

Position Update Rate:

Once per second

Maximum Velocity:

460 m/sec. (1000 knots/sec.)

Maximum Altitude:

18000 m (60000 ft)

Maximum Acceleration:



GPS Receiver and Antenna Specifications


Integrated Patch Antenna. Optional external antenna mounted on a rangepole or magnetic disk available


6; capable of tracking up to 6 satellites at once


L1 (single)

Signal types:

CA code (SPS) standard; optional carrier phase, code tracking


Drop Lock of -143 dBm Costas threshold, Acquisition of -134 dBm


Estimated Battery Life


GPS on


GPS off


Shelf Life

Required Recharger

1600 mAH

1 Day


1 Week


2 Months


2100 mAH

1 Day


1 Week


2 Months





  Position: Mode

Accuracy in meters





CEP (50%)

RMS (63%)

2DRMS (95%)


  SPS with SA





  SPS without SA










  Code Diff.

1 to 2

1 to 2.5

1 to 5


  Carrier Phase Diff.