bluetoothbluetooth-lowenergyspecifications

Error in Bluetooth specification? Heading field of Location and Speed


The Location and Speed characteristics in section 3.137 of the Bluetooth GATT Specification Supplement document defines the Heading field (Version Date: 2024-02-21)

It is specified as a uint16 with a unit multiplier of 10^-7 degrees. That seems obviously incorrect. A uint16 has a maximum value of 65535. When multiplied with 10^-7 it gives a maximum of 0.0065535 degrees.

I have found some implementation that uses 10^-2 as multiplier instead. Does anybody know whether that is what it should be?

How do I submit an errata on the specification, if I am not a Bluetooth SIG member?


Solution

  • This is almost certainly an error as you suggest. In the Navigation characteristic, Heading is defined as d=-2, just as you've seen. (Errors like this aren't incredibly common, but they certainly exist. I've run into clearly erroneous values before.)

    You can fill out an erratum as a Jira. But I don't believe you can access it without being part of a member company. (Adopter membership is free, but it's really only for companies.)