About mmGPS


We use Millimeter GPS+ because it is the perfect tool for layout, rough grading, fine grading,

blue-topping(in areas we can not use machine grade control) and other fine tolerance work.

With Millimeter GPS+, the days of lost productivity, using stringlines or running manually off of hubs,

are over.

Millimeter GPS+ combines the advantages of laser(multi-user & high vertical accuracy) with GPS

(multi-user & 3D) into one versatile, accurate and easy to use system. This technology has improved

our grading accuracy up to 300% over existing 3D-GPS machine systems.

Unlike any other laser technology, the PZL-1 transmitter sends out a wall of light 33’ tall and up to

2000’ in diameter.

We simply add the PZS-MC machine control sensor or PZS-1 rover sensor to our existing GPS+ system,

and watch our GPS vertical accuracy shrink down to numbers we never imagined before.

When we need more coverage? We can link up to four PZL-1 transmitters for a total of 8000’

horizontally and 132’ vertically. Unlike other systems, multiple machines and man rovers run off one transmitter, there is no limit!



Up to 300% more accurate than standard GPS

Large working range: up to 8000’ horizontal & 136’ vertical

Increased productivity - fewer passes needed to reach finish grade

Lower investment - one system works for rough & finish grade

Grade to tighter tolerances and eliminate high-cost material overruns

Moving material more than once-is a thing of the past 

Finish grade 24/7 even with minimal satellite coverage

Frequently Asked Questions(FAQ’s) about Topcon’s mmGPS Technology What is mmGPS?  

Topcon’s mmGPS is laser enhanced GNSS(Global Navigation Satellite System). By combining the

reliability and accuracy of laser technology with the omnipresence and convenience of GNSS 3D positioning, a more versatile and accurate positioning solution is achieved.

Is mmGPS laser technology different from conventional flat plane lasers?

YES. Conventional lasers emit a flat laser plane signal. The laser sensor at the rover end of the signal,

be it man or machine, must be moved up or down to find the signal. The position of the sensor must be maintained in order to continue reading the signal from the laser transmitter. The mmGPS transmitter called the PZL-1, utilizes Topcon’s unique Lazer Zone technology. The PZL-1 emits a patented

‘fan beam’ signal with a height of 10 meters(approx. 33 feet). As long as line of sight to the transmitter

is maintained and either the PZS-1 or PZS-MC is within the 10 meter field of view, measurement is maintained. This is very productive because the sensor is always in the field of view.

Is MMCS limited to using mmGPS for positioning only heavy equipment?

NO. mmGPS is for both man and machine. There are two sensors available, the PZS-1 and the PZS-MC.

The PZS-1 is a light weight laser sensor that mounts atop a rod and interfaces with a Topcon GNSS receiver.


The PZS-MC has a 360 degree window and is used for 3D machine control mounting atop a mast. The

GNSS antenna is part of the PZS-MC and interfaces’ with a Topcon GNSS machine control receiver.


The maximum working area for both vertical and horizontal for a mmGPS system with, One PZL-1 transmitter will cover 10 meters(approx. 33 feet) vertically and 600 meters(approx. 1968 feet)

horizontally. Up to four PZL-1 transmitters and be linked together increasing the vertical working

area to 133’ or 7880’ horizontally. The rovers dynamically move from one transmitter to the next seamlessly.