GNSS App: a Compass, with Places to be led back to and a level

Tab goes on from the Sky to a third view (issue #16): a rose that turns
with the device, the heading, where north came from and how long ago,
the sun on the rose, and a level. m marks where you stand as a Place,
t picks one as the target: an arrowhead on the rose, its distance and
bearing. The sensor's directions were checked by hand on the device.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

README.md

@@ -7,7 +7,7 @@ A multi-app firmware for the **M5Stack Cardputer ADV** with the **Cap LoRa-1262*
 What it does today:
 
 - **LoRa Scanner:** every packet it hears, with the Meshtastic or MeshCore header read; a spectrum Sweep; captures for Wireshark. It listens and never transmits: the mesh messenger is the next milestone.
-- **GNSS:** position, sky view, tracks as GPX.
+- **GNSS:** position, sky view, a compass that leads back to a marked place, tracks as GPX.
 - **Gemini:** a browser, with bookmarks and pages saved for offline.
 - **IRC:** over TLS, with logs on the card.
 - **Wi-Fi Tools:** the networks around, sorted, filtered, logged.