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How to calculate the heading accuracy of a SPRINT

12 October 2022

This article describes how to calculate the heading accuracy of a SPRINT 300/500/700

Equipment required

  • SPRINT instrument
  • Cable to connect to the CP port of the SPRINT
  • GPS aiding

1. Refer to the product manual to gain a step-by-step guide to connect to your SPRINT.
2. Configure an output telegram from the unit such as a SON2 to retrieve heading, pitch and roll (you will need to decide on your own method for collecting and presenting the recorded AHRS data).
3. Ensure you are proving the SPRINT with an aiding source such as GPS to initialise the INS algorithm.
4. Place the SPRINT on a calibrated base line with a known heading.
5. Record the heading data for a minimum of 2 hours.
6. Review the datasheet of your product to establish the sensor accuracy.

Using a Gen 3 SPRINT 500 for example, the Datasheet shows:

  • Heading = 0.04° Seacant latitude
  • Pitch and Roll = 0.01°

Calculating the Standard Deviation (SD)

  • 0.04° * (seacant (latitude**)) = heading SD
  • ** For Aberdeen the latitude equates to 57.19°

Example equation

  • 0.04*(1/cos (57.19)) = 0.07° max SD for heading

7. Present your recorded data so that you can calculate the standard deviation of the heading over the 2 hour period.

Viewing the results of your test, verify the SPRINT matches the calculated parameters. For the example of a SPRINT 500 in Aberdeen, this could be:

Test Maximum Standard Deviation
2 hour heading verification <= 0.07 (if using ABZ latitude)
2 hour roll verification <=0.01
2 hour pitch verification <=0.01



If the SPRINT has a greater standard deviation, then calculated, please contact and provide the following information:

  • Lodestar serial number
  • Method of testing
  • Results from test
  • Any recorded .bin log files


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