Revolutiontm GS - Gyro Stabilized Electronic Compass
If your compass application involves vibration,
acceleration, uneven terrain, or rough seas, you willfind the True North Revolution GS™ to be an
uncompromising solution that will outperform rival
units costing considerably more. The GS provides
remarkably accurate heading, pitch, and roll indynamic conditions. It all starts with a precision 3-axis
solid-state magnetometer. Two angular rate gyros
independently stabilize pitch and roll. They augmenta dual-axis, electrolytic tilt sensor that provides
precise tilt measurements in static environments. Twosets of independent filters, one set for pitch and one
for roll, combine gyro and electrolytic sensor
measurements to provide the best available tilt
measurements.

Then True North aligns the magnetic, tilt, and rate
sensors to a common set of axes using precisioncalibration equipment capable of measuring angles as
small as 0.001º. This alignment procedure, driven by
our proprietary calibration routines, minimizes axis
coupling and corrects for gyro drift errors.
The Revolution GS is compatible with True North’s
Revolution Upgrade compass. The GS board fits inthe same enclosure and has the same mounting holepattern and connectors. Identical NMEA sentences
are available, and the GS version includes additional
binary data output for temperature and diagnostics.
The Revolution GS comes with an enhanced versionof True North’s demonstration software that isbackward compatible with the Revolution Upgrade.
The magnetic calibration
procedure required upon
installation is identical, as arecabling and power requirements.

The recommended applications for the GS aremanned and unmannedvehicles, robotics, weather
buoys, antenna positioning,platform stabilization, marine
navigation, excavation
machinery, and irrigationequipment.

For more information, pricing,and availability, please e-mail:info@tntc.com.

The exceptional performanceof the GS is achieved by firstcalibrating all sensors over awide temperature range.

Features








Exceptional Dynamic PerformanceHeading within 3 typical for rates < 150 /secPitch and roll within 3 for rates < 150 /sec
High Static Accuracy
Heading within 0.5 or better
Tilt within 0.2 or better
Wide Operating Range42 Pitch and Roll80 Dip angle rangeTemperature -40 to 105C
Local Hard Iron to 1.5 Gauss
Precise CalibrationGyros calibrated for offset and gain from -40 to 85C
Rate sensors calibrated and aligned tomagnetometer and tilt sensor

Cross-axis error nearly eliminated on gyros andmagnetometer
Single Supply Operation
6 to 25V unregulated DC or
Reverse polarity protection









Fast Response
28 readings per second
Wake from standby in 50 msec
Low Power
30 mA operating
10 mA sample

2 mA standby
Wide Selection of ASCII or Binary Output dataHeading, pitch, and roll
Magnetometer X, Y, and Z
Temperature, input voltage, and dip angle
Output ASCII or binaryHorizontal X and Y magnetic field strength
Raw and conditioned gyro data
Two independent serial channels
Full-duplex RS-232 for the external RJ12

Either RS-232 or full-duplex RS-485 for the internal
connector
In-System Configuration and Test
Laptop can be connected while unit operates in situPerform hard and soft iron calibration

Monitor outputs and change user-definable settings

True North Technologies LLC • 43 Broad St, Suite B308 • Hudson, MA 01749 USA
Ph: 978-897-5400 • Email: info@tntc.com • Website: www.tntc.com© 2022 True North Technologies LLC

Revolution™ GS Electronic Compass

Specifications
Heading Performance
Parameter

Value

Conditions

Accuracy1

 0.5 rms
 3.0 rms
 0.3
36 msec
 80
 42
28 per second

Static, Tilt < 35 Dip < 60
Dynamic, rate < 150/sec
Static, no filter
Minimum, no filter

Repeatability
Response time
Dip Angle Range
Tilt Range
Update rate

1 May require calibration after installation to eliminate effect of local magnetic field

Pitch and Roll Performance
Accuracy
Repeatability
Range
Settling time
Electrical
Supply Current

Supply Voltage (VDD)
Environmental
Operating Temp
Storage Temperature
Humidity
MechanicalBox
PCB Size
PCB Mounting
WeightConnectors
Interface
Signal type
Baud rate
Character Format
Input Buffer Size
Output Buffer Size
Output Format
Output Data Rate
Operating Modes
Angle Units 0.2
 0.2
 42
0.1 sec

Factory calibrated
No filter

30 mA operating
10 mA sample
2 mA standby
6 – 25 Vdc unregulated

typicaltypicaltypical-40 to 105°C-50 to 150°C
0 to 90%

Gyros enabled

Non-condensing

Hammond Mfg1591MFL
1.8"W x 3.0"L x 0.6"H4 #4 screws, 1.4" x 2.2" spacing
4 oz. in box
8 pin, single-row, 0.1" friction header
6 pin RJ12 modular jackRS-232 and RS-485
2400, 4800, 9600, 19200, 38400, or 57600 bps
8 data, no parity, 1 stop
110 characters
110 characters
NMEA 0183 and binary
1 to 1650 sentences per minuteContinuous or sample
Degrees, mils, radians, 16-bit integer

True North Technologies LLC • 43 Broad St, Suite B308 • Hudson, MA 01749 USA
Ph: 978-897-5400 • Email: info@tntc.com • Website: www.tntc.com© 2022 True North Technologies LLC

Revolution™ GS Electronic Compass