I have been testing various gps apps for Enduro in place of very expensive GPS units and landed on Gaia. It works great so far. However, it falls short for Enduro in the same way that the expensive dedicated units do. I am a developer myself so I will tell you I am working on my own solution to this on the side but dont have as much time so Id be happy if Gaia beat me to it.
The problem: Enduro is following a track at a high pace. Many riders still use paper roll charts in addition to their expensive GPS units. The issue is, we get a track, import it into a GPS unit (or the app as I do) and can then "follow" this track, but even zoomed in it's hard to see where to go when you get 4 or 5 way splits while bouncing around at high speed. Roll charts are still invaluable for this. They have 3 key pieces of info, a distance until next turn, a symbol to indicate which way to go in "complex" junctions on a trail to easily and quickly see which way you'll be going without stopping, and a description or note (optional) such as "RT on trail #N2801" or "Gate 1"
The solution: I can't find good examples or documentation yet on using extensions but I think this solves the issue. We need a scheme for "extensions" to gpx file format that adds these 3 tag/values between track points. If the extensions are present, it's simple. When GPS reaches an extension tag between track points (so it's information about the NEXT junction, etc), display the "roll chart info" as an overlay on the map. This tells us say, in 2.2 miles we're going to be hitting a 3 way trail junction and taking the right turn in the fork.
I'm a seasoned engineer, seasoned rider who understands enduro well, and now reading and learning more about GPS and gpx files so I've got this fairly well worked out but not ready to develop just yet. I'm also willing to work with Gaia if you want to work with me on this. As I mentioned I haven't found enough info to fully understand "extensions" so if they can't fit between trackpoints, it may need to be a new official tag in gpx and I've also joined the developer group at Topografix in case that is the path required. There are a HUGE number of riders in the US, estimated over 8 million in 2003:
So even if this needs to be a tag in GPX 1.2 I see it as something to support officially if need be.
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