[Tagging] Garmin waypoints and routes (was: "Roles of route members" and before that "Merging tagging scheme on wiki pages of Hiking")

Peter Elderson pelderson at gmail.com
Wed Aug 28 08:11:36 UTC 2019

Then again, OsmAnd does have a snap-to-road switch. When this is on,
looking at the map when routing along a gpx-track does show the turns as
arrows on the roads. When the track does not follow any accessible road
(according to the OSM map), the arrows show a way around. It shows this for
the whole gpx-track in advance. If you stray from the track, the arrows
guide you back to the track,  and the voice directions do the same. Also,
the remaining distance and time to reach destination are recalculated. So I
think it actually does perform routing.
Still, it needs a linear sorted gpx-track, and I intend to provide those.
I'm not waiting for each and every app, program, device and site to
implement their own supersmart algorithms to produce a linear route from a
possibly chaotic and incosistent nested route relation. If standard
extraction software becomes available to do this, I will be very, very
happy. I am also more than willing to help develop such software (specs,
design, testing, applying), and I am sorry I can't program it myself!

(as a first step, a plugin for JOSM woud be safe and relatively easy I
think? May it could take a route relation containing start- and end nodes,
then perform the ingenious trick with routing where members of the relation
get very high weight, then write the result back (to JOSM, not OSM).
Advanced sorting!

Fr gr Peter Elderson

Op wo 21 aug. 2019 om 20:46 schreef Peter Elderson <pelderson at gmail.com>:

> I have to correct myself: I thought OsmAnd really performed routing when
> navigating using a gpx trail. It doesn't, I tested it today. It translates
> turns in the track into screen messgaes and spoken text messages, without
> doing anything with the map. So it will send you into a ravine if your
> track goes there.
> But it can route you to the start of your track, and when you go
> off-track, it routes you back on track.
> All the more reason why the gpx should be a correctly ordered single chain.
> Fr gr Peter Elderson
> Op di 20 aug. 2019 om 16:57 schreef Peter Elderson <pelderson at gmail.com>:
>> Andy Townsend <ajt1047 at gmail.com>:
>> On 19/08/2019 19:04, Peter Elderson wrote:
>> Ok, I accept I just don't know how it's done. So how is that done? How do
>> I tell my Garmin to guide me along, say, the Limes trail through the
>> Netherlands?
>> Essentially, you'd just look at the screen and follow that!  I tend to
>> use waypoints for an idea of things like "how long will it be until I get
>> to where I'm going to stop for lunch", not for "turn left here because
>> route XYZ turns left here", because you can see on the screen that route
>> XYZ "turns left here".
>> So it’s not done. The osm route is not used to route. You can see it and
>> keep yor dot on the line, but the navigating device does not navigate along
>> the route. It can navigate, it has the route, but it does not do it unless
>> I create gpx from the route, send that to the device, which then recreates
>> the route from the gpx.
>> If you want to add a series of waypoints and route along those then you
>> can, but want you can't typically do with one of the hiking-oriented
>> Garmins is follow a particular feature.  You could create an OSM-based
>> Garmin map that forced a device to route along a trail at the expense of
>> any other paths, but I certainly wouldn't want to do that as it would stop
>> me from leaving the trail to eat in a nearby town.
>> Nothing stops you from leaving the route, and I expect the device to
>> route me back to the track afterwards. And it does, and so does OsmAnd.
>> Creating a Garmin route from a GPX file is possible, but probably
>> impractical, as you'd need to restrict the number of points.  Apparently my
>> GPSMap 64 supports 200 routes with 250 points per route, and up to 5000
>> waypoints in total.
>> If only there were a way to store permanent routes in, say, a mapping
>> database, which could be used to determine what ways to follow...
>> You only need to load the section(s) for the next day or a few days.
>> Afterwards, just remove them. No problem. I have had no problems to load
>> the via degli dei as 7 sections, each a day’s walk. No restrictions
>> necessary.
>> I also loaded these in OsmAnd and had it guide me all the way
>> voice-in-ear, ie not having to look at the screen at all.
>> Where Garmin on-device routing is really useful is for when you need to
>> get to somewhere but don't have an on-screen route to follow - for example
>> if the weather's turned and you need to abort a previously planned route
>> and get another route to your destination from where you currently are.
>> It's also useful where there are natural obstacles like rivers, where the
>> distance on foot may be significantly more than the as-the-crow-flies
>> distance.
>> Best Regards,
>> Andy
>> _______________________________________________
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