gpx-ideas

GPX Extensions

Dinghy Racing

Overview

Example of a sailing dinghy with a custom GNSS training / racing instrument.

• gpx_pvt - cog + sog, plus accuracy estimates
• gpx_imu - hdg, trim (pitch), heel (roll)

See short video with data overlay at 1:28

Trackpoint

GPX 1.1 example:

<trkpt lat="50.5710623" lon="-2.4563484">
  <ele>1.90</ele>
  <time>2022-04-11T10:16:01Z</time>
  <sats>29</sats>
  <extensions>
    <pvt:ext>
      <pvt:cog acc="10.0">157.19</pvt:cog>
      <pvt:sog acc="0.542">3.542</pvt:sog>
    </pvt:ext>
    <imu:ext>
      <imu:hdg>275.23</imu:hdg>
      <imu:roll>15.25</imu:roll>
      <imu:pitch>10.15</imu:pitch>
    </imu:ext>
  </extensions>
</trkpt>

GPX 1.2 will allow for horizontal and vertical accuracy estimates:

<trkpt lat="50.5710623" lon="-2.4563484" acc="1.937">
  <ele acc="2.754">1.90</ele>
  <time>2022-04-11T10:16:01Z</time>
  <sats>29</sats>
  <extensions>
    <pvt:ext>
      <pvt:cog acc="10.0">157.19</pvt:cog>
      <pvt:sog acc="0.542">3.542</pvt:sog>
    </pvt:ext>
    <imu:ext>
      <imu:hdg>275.23</imu:hdg>
      <imu:roll>15.25</imu:roll>
      <imu:pitch>10.15</imu:pitch>
    </imu:ext>
  </extensions>
</trkpt>

Sailmon

The Sailmon Max currently outputs the following data to CSV files:

• Time + latitude + longitude
• HDT + SOG + COG
• TWA + TWD (both require an airspeed sensor)
• Heel + Trim
• Satellites + hAcc

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