Digital GPS Speedometer

High Quality GPS Speedometer For Automotive Applications

Hummingbird's GPS Speedometers provide a quick to install, vehicle-independent speed readout in vehicles that are not fitted with conventional speedometers.

Using data received from the Global Positioning Satellite network the GPS Speedometer calculates three-dimensional ground speed and displays it on a clear to read digital display.

This high technology solution eradicates the dependency on vehicle specific parameters, thereby reducing installation time and eradicating the need for periodic calibration.

Powerful Performance

Designed for harsh automotive environments, the module features 1 inch high, high brightness red LED digits.  Automatic contrast adjustment ensures that the driver is able to read the display in daylight, and is not blinded
at night. 

The ability to track 20 satellites simultaneously, enhanced receiver sensitivity and active antenna result in fast time-to-first velocity calculation as well as the ability to operate in the harshest RF environments such as canyons and cities. Speed errors will occur in RF blackout zones such as tunnels;
this is indicated to the driver through a flashing display.

Three dimensional velocity calculations are accurate to 0.2km/h and speed readings are updated 10 times per second.

Hummingbird's Digital GPS Speedometer can be user configured to work in kilometers per hour, miles per hour, knots or meters per minute.

A relay can be set to close when the speed exceeds a user specified set-point. Typical applications for the speed switch would be driver over-speed warning or motion detection. Activation speed is set via a dip switch internal to the device and can not be changed by the operator.  The maximum speed can be set to be
between 0 and 999 or between 0 and 99.9.  The more precise setting is suitable for slow vehicles like tractors.

Rugged Hardware

Hummingbird's GPS Speedometer is supplied in a rugged ABS plastic enclosure with a lexan facia. A fully adjustable dashboard mount stand allows for correct driver orientation. Antenna connection for the active antenna is provided through a gold-plated threaded SMA connector. The active antenna is available in two options:
  • magnetic mount, suitable for mounting in the interior of the vehicle, for example under the dashboard or rear window sill.
  • bulkhead mount, suitable for exterior mount, for example on the roof of the cab.

An internal antenna version is also available.

Power to the unit and switch outputs are provided through four colour-coded wires.

For optimum performance the antenna should be mounted horizontally and upright, and should have a clear view of the sky.

Performance Specifications

  • Speed range: minimum 2km/h; maximum 299km/h (or 199mi/h)
  • General: 20 channel tracking receiver
  • Update rate: 10Hz
  • Accuracy, horizontal: < 5m (50%), < 8 (90%)
  • Accuracy, altitude: < 10m (50%), < 16 m (90%)
  • Accuracy, velocity: < 0.06m/sec = 0.22km/h
  • Acquisition, after loss of lock: < 2s (90%)
  • Acquisition, first time power applied: < 38s (50%), < 42s (90%)
  • Acquisition, temporary loss of power: < 10s (50%), < 13s (90%)
  • Operational limits, altitude: 18000m
  • Operational limits, Velocity: 300km/h

Electrical Characteristics

  • Input voltage: 9V to 36V
  • Power consumption: maximum 2.5W (200mA @ 12V) – full brightness, including antenna
  • Relay output: 36V max, 4.5A max
  • Battery backup: > 20 days

Physical Characteristics

  • 86mm(width), 66mm(height), 25mm(depth); digit height 1 inch
  • Antenna: 51mm (L), 42mm (W), 14mm (H)
  • Antenna cable length: 3-5m

Environmental Specifications

  • Operating temperature: -40°C to +85°C
  • Storage temperature: -55°C to +105°C
  • Humidity: 5% to 95% R.H. non condensing at 60°C

Interface Specifications

Power and pulse output:

  • Red input voltage (10V to 36V)
  • Black ground (0V)
  • Green / Yellow Speed switch (normally open)
RF interface:
  • SMA (compatible connector supplied with antenna)
  • Magnetic mount, bulkhead mount or internal antenna options available


Hummingbird Electronics has designed the product for use in a broad range of applications. It is however solely the customer's responsibility to evaluate the device and determine it's suitability in their end application.

Hummingbird Electronics does not suggest or make any recommendation as to the suitability of parameters that determine angle, height, impact, speed, force, accident, harsh braking, roll-over or rate-of-turn events, input or output voltage or current. Parameter values stated or implied in this document are for explanation only and should not be taken as typical or representative of a real world situation.


Products are not authorised for use in critical safety or other applications where a failure may reasonably be expected to result in personal injury, loss of life, or catastrophic property damage. If a customer uses or sells the products for use in any such applications, the customer acknowledges that such use or sale is at customer's sole risk. The customer will indemnify, defend or hold Hummingbird Electronics and their electronic component suppliers/assemblers harmless from and against any and all liabilities and costs arising out of or in connection with use of product or sale.
Digital GPS Speedometer

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