[Routing] Routing on Garmin etrex using OSM

[Robert (Jamie) Munro]

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Marcus Wolschon wrote:
| Mark Williams schrieb:
| | Hi,
| |
| | good start on this - I was looking at the problem over the weekend.
| |
| | I'm starting at the bottom of the XML learning curve here, but are your
| | defaults assuming untagged ways are (barely) navigable? This could be
| | entertaining if so...
|
| Untagged ways may be anything. From woodland, power-lines or rivers
| up to foot-ways.
| Only ways tagged with the highway-tag are navigatable.

For a mobile device, I'd like it to route over untagged ways, then when
I reach an untagged (or FIXME or unnamed) way, the device should notify
me (it should say something like "turn left into untagged way"), and I
could tag it, or voice annotate it (if I am driving and don't want to
stop). If I can't go that way, then I should be able to press a shortcut
key to tell it, and it should quickly recalculate an alternative route.

I don't think it is likely to route me along a power line because power
lines don't connect with roads - they just cross over one another. It
may try and route me between two untagged level crossings on an untagged
railway, but I don't think that will happen very often. If it does, the
data needs to be found and fixed. If I am routed over it, I will have
found it :-).

Some people, e.g. truck drivers, will need more conservative routing -
they don't want to go anywhere that isn't definitely big enough to take
a truck, but as an OSM editor, I'd like my routing algorithm to take me
past or through as many unmapped areas of the map as possible so that
the map will be continuously improved. If I get stuck, I just tag the
way as impassable, turn around and follow the new route.

Robert (Jamie) Munro
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