The 3DM-DH®​3 is a downhole orientation sensor and datalogger. It incorporates acceleration sensors, magnetic field sensors, and temperature sensors, together with an on-board microprocessor, embedded software algorithm, non-volatile memory for configuration, flash datalogging memory, and serial communication interface. Its form-factor, rated temperature range and power supply requirements are optimized for downhole applications. The 3DM-DH3 provides accurate drill path measurements including Inclination, Azimuth, GTF, MTF, Dip Angle, sensor temperatures, G-TOT and H-TOT.

Datasheet Manual
Where to Buy?
U.S. International OEM

The 3DM®-RQ1-45 is a compact, ruggedized, tactical-grade all-in-one navigation solution with integrated GPS and magnetometers, high noise immunity, and exceptional performance.  It takes advantage of some of the latest mems sensor technology, exhaustive callibration, and a custom made Kalman Filter to deliver capibillities that rival units that cost many times more. 

Product Highlights

  • High performance integrated GPS receiver and MEMS sensor technology provide direct and computed PVA outputs in a small package.
  • Triaxial accelerometer, gyroscope, magnetometer, and temperature sensors, and a pressure altimeter achieve the best combination of measurement qualities.
  • Dual on-board processors run a sophisticated Extended Kalman Filter (EKF) for excellent position, velocity, and attitude estimates.
  • Ruggedized enclosure designed to meet DO-160G for deployment in harsh environments
Datasheet Manual
Where to Buy?
U.S. International OEM

List Price:
List Price:

Best in Class

  •     Precise downhole orientation
  •     High-speed sample rate & flexible data outputs
  •     Extended use, low-power data logging

Easiest to Use

  •     Rapid deployment in the drill string
  •     Outputs drill path measurements

Cost Effective

  •     Reduced cost and rapid time to market for customer’s applications
  •     Aggressive volume discount schedule

Best in Class Performance

  • Fully calibrated, temperature compensated, and mathematically aligned to an orthogonal coordinate system for highly accurate outputs
  • Bias tracking, error estimation, threshold flags, and adaptive noise, magnetic, and gravitational field modeling allow for fine tuning to conditions in each application.
  • Compact, low profile, and lightweight

Ease of Use

  • Easy integration via comprehensive SDK
  • Common protocol between 3DM-GX3, GX4, RQ1, GQ4, GX5, and CV5

Cost Effective

  • Out-of-the box solution reduces development time.
  • Volume discounts

Orientation range

360˚ all axes (orientation angles); inclination, azimuth, GTF, MTF, Dip Angle, G-TOT, H-TOT

A/D resolution

24 bits accelerometer; 16 bits magnetometer

Angle resolution



± 0.2˚ inclination

± 0.5˚ azimuth

Angle measurement repeatability

0.1 °

Digital output rate/logging rate

up to 8 Hz

Output modes

acceleration and magnetic field vectors plus temperature; orientation angles plus temperature

Digital output

RS-422 serial (four-wire full-duplex) standard

Serial data rate

115200 baud

Datalogging capacity

up to 32,768 data records

Supply voltage

+6.0 VDC min, +10.0 VDC max

Supply current

50 mA typical when connected to host

16 mA typical when logging at 8Hz

500 μA typical when logging at 1/4 Hz

50 μA typical in deep sleep mode


through hole PCB pads (solder-in)

2 mm pitch, 2 row 16 pin header

Operating Temperature

- 40 ˚C to 125 ˚C (-10 ˚C to 125 ˚C with recommended batteries)


177 mm x 21 mm diameter


91 grams

Shock limit

500 g

Enclosure material

anodized aluminum


Windows XP, Vista, 7


Integrated sensors

Triaxial accelerometer, triaxial gyroscope, triaxial magnetometer*, temperature sensors, and GPS receiver

Data outputs

Inertial Measurement Unit (IMU) outputs: acceleration, angular rate, magnetic field*, ambient pressure, deltaTheta, deltaVelocity

Computed outputs

Extended Kalman Filter (EKF): LLH position, NED velocity, attitude estimates (in Euler angles, quaternion, orientation matrix), bias compensated angular rate, pressure altitude, gravity-free linear acceleration, gyroscope and accelerometer bias, scale factors and uncertainties, gravity and magnetic models, and more.

Global Positioning System outputs (GPS): LLH position, ECEF position and velocity, NED velocity, UTC time, GPS time, SV. GPS protocol access mode available.

Inertial Measurement Unit (IMU) Sensor Outputs





Measurement range

±5 g

300°/sec (standard)

±75, ±150, ±900°/sec (options)

±2.5 Gauss


±0.03 % fs

±0.03 % fs

±0.4 % fs


<0.04 mg



Bias instability

±0.02 mg



Initial bias error

±0.001 g


±0.003 Gauss

Scale factor stability

±0.05 %

±0.05 %

±0.1 %

Noise density

50 µg/Hz


100 µGauss/Hz

Alignment error




Adjustable bandwidth

250 Hz (max)

160 Hz (max)


Vibration induced noise


0.06°/s RMS/g



Vibration rectification error (VRE)





IMU filtering

4 stage filtering: analog bandwidth filter to digital sigma-delta wide band anti-aliasing filter to (user adjustable) , low pass filter; coning and sculling integrals computed at 1 kHz

Sampling rate

10 kHz

10 kHz

50 Hz

IMU data output rate

1 Hz to 500 Hz

Computed Outputs

Position accuracy

±2.5 m RMS horizontal, ± 5 m RMS vertical (typ)

Velocity accuracy

±0.1 m/s RMS (typ)

Attitude accuracy

±0.1° RMS roll & pitch, ±0.5° RMS heading (typ)

Attitude heading range

360° about all axes

Attitude resolution

< 0.01°

Attitude repeatability

0.1° (typ)

Calculation update rate

500 Hz

Computed data output rate

1 Hz to 500 Hz

Global Positioning System (GPS) Outputs

Receiver type

50-channel u-Blox 6 engine GPS, L1 frequency, C/A


GPS data output rate

1 Hz to 4 Hz


Cold start: 36 sec, aided start: 36sec, hot start: <1 sec


Tracking: -159 dBm, cold start: -147 dBm, hot start: -156 dBm

Velocity accuracy

0.1 m/sec

Heading accuracy


Horizontal position accuracy

GPS: 2.5 m CEP SBAS: 2.0 m CEP

Time pulse signal accuracy

30 nsec RMS

< 60 nsec 99%

Acceleration limit

4 g

Altitude limit

No limit

Velocity limit

500 m/sec (972 knots)

Operating Parameters


RS422 (9600 bps to 460,800 bps, default 115,200)

Power source

+ 10 to + 28 V dc

Power consumption

standard model: 2.5 W (typ)

low temperature model: 2.5 W (typ) at 0 °C to +80

°C, up to 6 W continuous and 25 W occasional at

-55 °C to 0 °C (for internal heater)

Operating temperature

-40 °C to +80 °C

(-55 °C to +80 °C low temperature model available*)

Vibration limit

6 g RMS, 10 Hz to 2 kHz

Mechanical shock limit

750 g (half-sine, 2 msec powered, any axis)

MTBF 180,000 hours (Telcordia method I, AC/30C)

Physical Specifications


88.3 mm x 76.2 mm x 22.2 mm


205 grams

Environmental rating


Enclosure material




Data/power output: 7 pin circular Glenair series 801

GPS antenna: SMA type


MIPMonitor, MIPHard and Soft Iron

Calibration, Windows XP/Vista/7/8 compatible


Common protocol between 3DM-GX3, GX4, RQ1, GQ4, GX5, and CV5

Software development kit (SDK)

MIPdata communications protocol with sample code available (OS and computing platform independent)

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