OEM638™ Triple-Frequency GNSS Receiver

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The OEM638 is a Global Navigation Satellite System (GNSS) receiver within NovAtel's OEM6 series of products. From standalone metre-level to RTK centimetre-level positioning, the fully featured OEM638 provides the flexibility to meet your unique positioning needs. With 240 channels and comprehensive tracking and positioning with all current and planned GNSS signals, the OEM638 is field upgradeable, eliminating the need for future hardware changes. The unprecedented user configurability of the OEM638 makes it an ideal solution for reference station, timing and a wide range of precision positioning applications.


  • 240 channels to support all constellations
  • Advanced interference rejection for robust operation in harsh interference environments
  • 4GB onboard memory for data logging and easy storage and retrieval
  • Up to 100 Hz data output to meet your high dynamic needs


  • Current and upcoming GNSS signal support ensures future proofing of your GNSS products
  • Powerful and improved performance to work with your demanding applications
  • Application Programming Interface (API) reduces hardware requirements and complexity improving your ROI and time to market
  • SPAN® ready for rapid integration in GNSS+INS
  • Multiple communication interfaces provide flexible and fast integration


System Type Board  
General Info Length (mm) 125.00
  Width/Diametre (mm) 85.00
  Height (mm) 14.30
  Weight (g) 84.00
  Typical Power Consumption (W) 2.80
Signal Tracking GPS L1, L2, L2C, L5
  Galileo E1, E5a, E5b, AltBOC
  BeiDou B1l, B2l
  QZSS L1, L2C, L5
Number of Com Ports CAN Bus 2
  Ethernet 1
  RS-232 2
  USB Host 2
  USB Device 1
  Supports RS-422 (mode pin)  
Performance1 Accuracy (RMS)
  Single Point L1 1.5m
  Single Point L1/L2 1.2m
  SBAS 0.6m
  DGPS 0.4m
  NovAtel CORRECT™  
  TerraStar-C 4cm
  Veripos Apex 6cm
  RT-2® 1cm+1ppm

Easy System Integration

The OEM638 is designed and built with a focus on product quality and ease of integration. With robust interference rejection, a powerful Application Programming Interface (API), 4 GB onboard data storage, wide input voltage and a host of interface options, integration is simplified and overall system costs are reduced. Combined with NovAtel's outstanding customer support, the OEM638 greatly improves your time to market and return on investment.

The Secret To Positioning Success

Developed for efficient and rapid integration, our GNSS products have set the standard in quality and performance for over 20 years. State-of-the-art, lean manufacturing facilities in our North American headquarters produce the industry's most extensive line of OEM receivers, antennas and subsystems. All of our products are backed by a team of highly skilled design and customer support engineers, ready to answer your integration questions.

1. TerraStar-L and RTK ASSIST are not available on the OEM638. 

Supporting Products

Other product categories which are required with this product to create a complete system.


GNSS receiver performance is dependent on your choice of antenna. We offer high performance, compact, low cost and ground reference station antennas. Our anti-jam antenna is available for military or homeland security applications

Alternate Products

Other similar products which could be used instead of the product, depending on application.


Rugged Enclosure Delivers Scalable GNSS with Heading and Wireless Communication Options

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Accessories can be purchased to support your product development efforts or assist in product integration.

OEM Development Kit

The OEM Development Kit allows quick and easy evaluation of all features of the OEM6, OEMV and OEMStar GNSS cards

Optional Products

Optional products can be added to a system to add or enhance functionality.

OEM Development Kit

The OEM Development Kit allows quick and easy evaluation of all features of the OEM6, OEMV and OEMStar GNSS cards


GrafNav is our static/kinematic baseline processor

GrafNav Static

GrafNav Static is a batch static baseline processor and network adjustment package