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A new NOTAM showed up for SQL that I hadn't seen before.
- Navigation NOTAMs
- San Carlos CA [SQL]: October NOTAM #6
- Navigation GBT out of service
The flight briefer wasn't able to explain it, essentially saying it isn't anything I needed to be concerned about. I asked the tower and they said they really didn't know the details but it wasn't anything that impacted their approaches (e.g. GPS).
The Pilot/Controller Glossary gives some insight:
GROUND-BASED TRANSCEIVER (GBT)- The ground-based transmitter/receiver (transceiver) receives automatic dependent surveillance-broadcast messages, which are forwarded to an air traffic control facility for processing and display with other radar targets on the plan position indicator (radar display).
Looks like it is related to ADS-B.
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