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OBDII Odometer
The OBDII Odometer is a smart interface cable that communicates with a vehicle's on-board computer to determine the current vehicle speed. It outputs real time vehicle speed over an RS232 serial data interface. When connected to one of Advanced Navigation's Spatial series of GPS/INS products it allows for outstanding navigation accuracy when GPS is not available.
Supports Almost All Vehicles

With built in support for eleven different OBDII communication protocols, the OBDII Odometer supports almost all modern vehicles on the market. It is completely plug and play with no setup required and can be switched between vehicles in seconds.

ABS Speed and Reverse Detection

On GM, Ford and some European vehicles, the OBDII Odometer is able to retrieve vehicle speed from the ABS (Anti-lock Braking System) system which provides a very high resolution speed. On all other vehicles the OBDII Odometer will provide speed from the transmission which is still a very accurate reference. The OBDII Odometer is also able to determine when the gearbox is in reverse on a range of vehicles.

Miniature Durable Design

The OBDII Odometer has a miniature in-line design that is easy to fit into any vehicle. It features a strong ABS plastic shell and tough strain relieved cabling.


The OBDII Odometer is protected from surges, reverse polarity, brown outs and overvoltage to continue operating through harsh electrical conditions. It's communications interface is optically isolated to prevent ground loops and protect sensitive equipment connected to it. It is built on top of a safety oriented real time operating system and all software is designed and tested to safety standards with fault tolerance in mind.


In urban environments where multipath is a big problem for GPS/INS units, the OBDII Odometer can help to increase accuracy and reduce position drift.


In security applications where GPS systems may be jammed, the OBDII Odometer can assist a GPS/INS to continue providing accurate positioning through jamming.


In surveying applications that require continuously accurate positioning even when passing under heavy tree coverage and through tunnels, a GPS/INS combined with the OBDII Odometer is able to provide the results required.


For mining applications that need to monitor vehicle speeds around the site for safety, the OBDII Odometer can be used standalone to easily retrieve the required data without any intrusive installation.

Protocols SupportedISO 9141-2
ISO 11898
ISO 14230-4
ISO 15765
ISO 15765-4
SAE J1939
Other Manufacturer Specific
Interface IsolationOptically Isolated
Speed115200 baud
ProtocolAN Packet Protocol
Output Data Rate10 Hz
Operating Voltage9 to 16 V
Input ProtectionSurge
Over-voltage and Under-voltage
Brown Out
Reverse Polarity
Power SourceOBDII Connector
(vehicle power)
Power Consumption(Typical)0.72 W
Operating Temperature-40 °C to 85 °C
Environmental ProtectionIP54
Weight202 grams
Direct Link
OBDII Odometer Reference Manual
OBDII Odometer Viewer V1.1 (Windows & Linux)

A very basic utility to view the data from the OBDII Odometer. Java is required to run this program.

OBDII Odometer SDK V1.0

The OBDII Odometer SDK provides royalty free example source code for interfacing with OBDII Odometer through the AN Packet Protocol. The languages provided are C/C++, Java, and .Net C#.

OBDII Odometer Firmware V1.1

The firmware for all hardware versions of OBDII Odometer. The changelog can be found in the OBDII Odometer reference manual.