README: add sensor-only feature.
Part of
@@ -78,7 +78,7 @@ _OpenTracks_ is a sport tracking application that completely respects your priva
* __Photos and Markers:__ mark interesting locations while tracking
* __Export:__
* export tracks either as KMZ (incl. photos), KML, or GPX
- * export automatically after each recording (e.g., to sync)
+ * export automatically after each recording (e.g., to sync via [Nextcloud](https://nextcloud.com/))
* avoid duplication: each exported file contain a random unique identifier (i.e., `opentracks:trackid`)
* __Altitude:__
* gain/loss via barometric sensor (if present)
@@ -89,6 +89,8 @@ _OpenTracks_ is a sport tracking application that completely respects your priva
* cycling: cadence
* cycling: power meter
* running: speed and cadence
+ * support for BLE sensor training only (i.e., without GPS) for indoor training
+
An overview of tested sensors: [README_TESTED_SENSORS.md](README_TESTED_SENSORS.md)
### Gadgetbridge integration
