diff --git a/mesh.proto b/mesh.proto
index ae7b65b..bc1b104 100644
--- a/mesh.proto
+++ b/mesh.proto
@@ -56,7 +56,7 @@ message Position {
    */
 
   /*
-   * In meters above MSL
+   * In meters above MSL (but see issue #359)
    */
   int32 altitude = 3;
 
@@ -73,6 +73,157 @@ message Position {
    * seconds since 1970
    */
   fixed32 time = 9;
+
+  /*
+   * Precision positioning elements - optional and usually not included
+   * ------------------------------------------------------------------
+   */
+
+  /*
+   * How the location was acquired: manual, onboard GPS, external (EUD) GPS
+   */
+  enum LocSource {
+    LOCSRC_UNSPECIFIED = 0;
+    LOCSRC_MANUAL_ENTRY = 1;
+    LOCSRC_GPS_INTERNAL = 2;
+    LOCSRC_GPS_EXTERNAL = 3;
+    /*
+     * More location sources can be added here when available:
+     *   GSM, radio beacons (BLE etc), location fingerprinting etc
+     */
+  }
+
+  LocSource location_source = 10;
+
+  /*
+   * How the altitude was acquired: manual, GPS int/ext, etc
+   * Default: same as location_source if present
+   */
+  enum AltSource {
+    ALTSRC_UNSPECIFIED = 0;
+    ALTSRC_MANUAL_ENTRY = 1;
+    ALTSRC_GPS_INTERNAL = 2;
+    ALTSRC_GPS_EXTERNAL = 3;
+    ALTSRC_BAROMETRIC = 4;
+  }
+
+  AltSource altitude_source = 11;
+
+  /*
+   * Positional timestamp (actual timestamp of GPS solution) in integer epoch seconds
+   */
+  fixed32 pos_timestamp = 12;
+
+  /*
+   * Pos. timestamp milliseconds adjustment (rarely available or required)
+   */
+  int32 pos_time_millis = 13;
+
+  /*
+   * HAE altitude in meters - can be used instead of MSL altitude
+   */
+  sint32 altitude_hae = 14;
+
+  /*
+   * Geoidal separation in meters
+   */
+  sint32 alt_geoid_sep = 15;
+
+  /*
+   * Horizontal, Vertical and Position Dilution of Precision, in 1/100 units
+   * - PDOP is sufficient for most cases
+   * - for higher precision scenarios, HDOP and VDOP can be used instead,
+   *   in which case PDOP becomes redundant (PDOP=sqrt(HDOP^2 + VDOP^2))
+   */
+  uint32 PDOP = 16;
+  uint32 HDOP = 17;
+  uint32 VDOP = 18;
+
+  /*
+   * GPS accuracy (a hardware specific constant) in mm
+   *   multiplied with DOP to calculate positional accuracy
+   * Default: "'bout three meters-ish" :)
+   */
+  uint32 gps_accuracy = 19;
+
+  /*
+   * Ground speed in m/s and True North TRACK in 1/100 degrees
+   *
+   * Clarification of terms:
+   * - "track" is the direction of motion (measured in horizontal plane)
+   * - "heading" is where the fuselage points (measured in horizontal plane)
+   * - "yaw" indicates a relative rotation about the vertical axis
+   */
+  uint32 ground_speed = 20;
+  uint32 ground_track = 21;
+
+  /*
+   * GPS fix quality (from NMEA GxGGA statement or similar)
+   */
+  uint32 fix_quality = 22;
+
+  /*
+   * GPS fix type 2D/3D (from NMEA GxGSA statement)
+   */
+  uint32 fix_type = 23;
+
+  /*
+   * GPS "Satellites in View" number
+   */
+  uint32 sats_in_view = 24;
+
+  /*
+   * Sensor ID - in case multiple positioning sensors are being used
+   */
+  uint32 sensor_id = 25;
+
+  /*
+   * Values relevant mainly to airborne users
+   */
+
+  /*
+   * Orientation angles of aircraft:
+   * - heading: True North direction in which the fuselage is pointing
+   * - roll: angle between trans axis and trans-long plane (positive = right wing low)
+   * - pitch: angle between horizontal axis and horizontal plane (positive = nose up)
+   * All values in 1/100 degrees
+   */
+  uint32 heading = 30;
+  sint32 roll = 31;
+  sint32 pitch = 32;
+
+  /*
+   * True air speed in meters/second
+   */
+  uint32 air_speed = 33;
+
+  /*
+   * Distance to ground (measured directly, i.e by a range sensor)
+   *   in cm (1/100 of meters)
+   */
+  uint32 ground_distance_cm = 34;
+
+  /*
+   * End of values relevant to airborne users
+   */
+
+  /*
+   * Estimated/expected time (in seconds) until next update:
+   * - if we update at fixed intervals of X seconds, use X
+   * - if we update at dynamic intervals (based on relative movement etc),
+   *   but "AT LEAST every Y seconds", use Y
+   */
+  uint32 pos_next_update = 40;
+
+  /*
+   * A sequence number, incremented with each Position message to help
+   *   detect lost updates if needed
+   */
+  uint32 pos_seq_number = 41;
+
+  /*
+   * END precision positioning elements
+   */
 }
 
   /*
diff --git a/radioconfig.proto b/radioconfig.proto
index ffc45fa..7be2507 100644
--- a/radioconfig.proto
+++ b/radioconfig.proto
@@ -177,6 +177,46 @@ enum LocationSharing {
   LocDisabled = 2;
 }
 
+/*
+ * Bit field of boolean configuration options, indicating which optional 
+ *   fields to include when assembling POSITION messages
+ * Longitude and latitude are always included (also time if GPS-synced)
+ *
+ * NOTE: the more fields are included, the larger the message will be -
+ *   leading to longer airtime and a higher risk of packet loss
+ */
+enum PositionFlags {
+    /* Required for compilation */
+    POS_UNDEFINED = 0x0000;
+
+    /* Include an altitude value (if available) */
+    POS_ALTITUDE  = 0x0001;
+
+    /* Altitude value is MSL */
+    POS_ALT_MSL   = 0x0002;
+
+    /* Include geoidal separation */
+    POS_GEO_SEP   = 0x0004;
+
+    /* Include the DOP value ; PDOP used by default, see below */
+    POS_DOP       = 0x0008;
+
+    /* If POS_DOP set, send separate HDOP / VDOP values instead of PDOP */
+    POS_HVDOP     = 0x0010;
+
+    /* Include battery level */
+    POS_BATTERY   = 0x0020;
+
+    /* Include number of "satellites in view" */
+    POS_SATINVIEW = 0x0040;
+
+    /* Include a sequence number incremented per packet */
+    POS_SEQ_NOS   = 0x0080;
+
+    /* Include positional timestamp (from GPS solution) */
+    POS_TIMESTAMP = 0x0100;
+}
+
 /*
  * The entire set of user settable/readable settings for our radio device.
  * Includes both the current channel settings and any preferences the user has
@@ -485,6 +525,11 @@ message RadioConfig {
      */
     uint32 environmental_measurement_plugin_sensor_pin = 147;
 
+    /*
+     * Bit field of boolean configuration options for POSITION messages
+     * (bitwise OR of PositionFlags)
+     */
+    uint32 position_flags = 150;
 
   }