Label are not all standard, each LRU can use custom values.

Non-authoritative list of some labels:

 - [ARINC 429 Labels][1]

Labels used by a Laseref VI IRS to output values:

[![enter image description here][2]][2]  
<sup>Source: [Honeywell][3]</sup>

 - Yaw rate = 330
 - Wind direction (true) = 316
 - Heading (true) = 314

As commented by @Lnafziger, the value you are after maybe the direction of the last two values, or simply the heading as suggested by @DeltaLima. If you can describe further your needs, additional may be available too.

You would have to confirm with the documentation of your LRU.
  [1]: https://sites.google.com/site/thel1011projectwiki/simulator-software/arinc-429-labels
  [2]: https://i.sstatic.net/UXyoB.png
  [3]: https://www51.honeywell.com/aero/common/documents/myaerospacecatalog-documents/BA_brochures-documents/Laseref_VI_FINAL.pdf