Industrial Measurement Solutions
About Us Partners Latest News Contact us 
  Home :: Mobile Mapping :: Products :: OXTS GPS Inertial Units :: xNAV




xNAV series

Today’s unmanned aerial and ground vehicles require compact, lightweight and highly accurate GPS + INS solutions. Enter xNAV from OXTS. The xNAV system is designed to deliver superior position, roll/pitch and heading data even in challenging operating environments without dominating the weight allowance of the aircraft.

Small, compact, lightweight

This product is all about size and accuracy. Just under 380g for the xNav 200, 500 and a little under 425g for the xNav550, and a little larger than a computer mouse, the xNAV fills the gap between light-weight inertial systems that are not accurate enough and accurate inertial systems that are not small enough. In UAV’s (unmanned aerial vehicles) the xNAV is accurate enough to give about 1m pixel accuracy at a height of 1000m but without dominating the weight allowance of the aircraft.


2cm position accuracy

Tight-coupling, differential GPS, GPS-heading and, of course, fantastic inertial sensors all combined to give great performance. The tight-coupling ensures GPS measurements continue to be used in difficult conditions. Differential GPS, post-processed from a standard RINEX file, make it easy to achieve sub-metre accuracy. Combined forward-backwards (in time) processing and the odometer input (for wheel based vehicle use) minimizes the drift when GPS is not available to 2.5m in 1 minute or 1km, surpassing many larger and more expensive systems.

0.05° heading using dual GPS

Unique in low-weight inertial systems, the dual-antenna GPS included in the xNAV gives constant heading performance of 0.05 degrees, far exceeding what can be achieved using magnetic sensors and without drift. OxTS has combined the best MEMS sensors available and calibrated them using our world-leading calibration technology. Because we control the inertial sensors and the Kalman Filter, we model each part of the system to bring the optimal solution in a turnkey package.

Turnkey integration

24 hours of data saved internally can be post-processed using the OxTS tool chain. Real-time outputs include NMEA GPGGA and 1PPS for synchronising other sensors. A timing input can accurately timestamp camera shutter or other external events and the software will interpolate the 100Hz measurements to the exact event time. These make it easy to interface to cameras, laser scanners and other sensors.


xNav xNAV200

The xNAV200 is a small GPS/INS system which is ideal for all size and weight constrained applications. The system is designed to deliver superior position, roll/pitch and heading data even in challenging operating environments. 4 GB of on-board storage is available, allowing four days' worth of measurements to be stored internally. The xNAV200 logs data during capture which can then be easily downloaded from the system and post-processed using our advanced software, which is included as standard at no extra cost.


xNav xNAV250

The xNAV250 GPS-aided INS is ideal for users requiring maximum performance on a tight budget. The xNAV250 uses the same survey-grade dual frequency GNSS receivers and custom MEMS IMU as the xNAV550, for centimetre-level position accuracy and precise orientation and true heading. The only difference is the xNAV250 is a logging only solution allowing users to download data from the system and post-process it with our advanced post-processing software, which is included free of charge.


xNav xNAV500

The xNAV500 is a compact, lightweight GPS-aided inertial navigation system, perfectly suited for all applications where size and weight as well as performance matter. It measures and outputs position (50 cm), heading (0.15°), roll/pitch (0.05°) and much more in real-time. Your data can also be post-processed later with our advanced software suite, included free of charge. It is ideal for use on UAVs and other weight constrained applications.


xNav xNAV550

The xNAV550 integrates dual L1/L2 GNSS receivers for 2 cm RTK position accuracy. The improved receivers also mean better heading accuracy. The xNAV550 is 5 mm taller than the other models and slightly heavier at 425 g to accommodate to bigger receivers, but still matches the other models for length and width and features the same IP65 rated anodised aluminium enclosure.



Parameter xNAV 550
Position accuracy
0.02m CEP RTK
Velocity accuracy
0.1 km/h RMS

10 mm/s²

Acceleration range






Angular Rate in-run bias stability


Angular Rate range


Measurement rate


Position drift (post-processed, using odometer)

2.5m (1 minute or 1km)

Operating temperature

-30°C to +70°C

Power input

10 - 31V

Power consumption  
Dimensions (mm)

125 x 77 x 36



Logging capacity

24 hrs (IMU+GPS)


Ethernet, Serial

Dual Antenna


Note: Specification valid for ±1g and open-sky conditions