On Tue, Nov 20, 2018 at 06:01:21PM -0500, Greg Troxel wrote:
"'Xavier' via Osmand" <[email protected]> writes:
On Tue, Nov 20, 2018 at 04:59:42PM -0500, Greg Troxel wrote:
Relative to a Nuvi, negatives for OSMand are:
- some goofy routing, due to wrong assumptions in osmand about how
long things take. Specifically:
* some issues where _link roads without an explicit speed get
treated at the default speed for that class, and usually you
can/shoudl only go half as fast on link roadsa[
In the US (at least) link roads have an 'advisory' max speed which
can be added to OpenStreetMap via the maxspeed:advisory tag [1].
Assuming Osmand makes use of maxspeed:advisory then this might mean
that editing the link roads where you find an issue to add
maxspeed:advisory into OpenStreetMap could fix this issue for you.
Yes, that might help. Do you know if osmand actually uses
maxspeed:advisory as the speed when present?
I do not know if it does or not.
But, my point is that for a motorway_link, for routing purposes, it is
not reasonable to assume 65 mph as the speed. 30 mph is a far better
assumption in terms of causing the chosen routes to be sane.
Agreed. Doing nothing more than using maxspeed/2 of the main road for
the _link roads would produce a better approximation.
Using maxspeed:advisory would be better, as not all link roads are
signed at maxspeed/2 relative to their main roads.
The positives are:
- ability to have really up-to-date data via osmlive (vs maps updated
on the 10th, so with plain osmand your data is from 10 to 40 days
old, unless you don't bother to update -- still very fresh)
And further, ability to actually update the data yourself (via editing
OpenStreetMap where you find issues/missing data) and seeing the
changes appear in Osmand.
I can do that with my Garmin - I was comparing to using mkgmap. But if
the OP meant with the proprietary maps, then absolutely, this is a huge
point in osmand's favor.
In my case, my comment was indeed with respect to the proprietary maps.
I had a TomTom (still have, actually, but it's now gone unused for a
while) and therefore I had no ability (that I'm aware) of using any map
other than TomTom's proprietary maps.
- not having to have a second device, assuming you'd have your phone
anyway. But you really need external power for any length of time.
The need for external power is universal. My old TomTom device also
needed its external power plug for any extended length of time as
well.
My garmin etrex 30 can operate all day on a pair of AA NiMH. But yes,
other than that, you need power.
Nice. My old TomTom, when its battery was new, would I think run the
better part of a day on battery alone. By the time it retired,
however, its battery only really had a couple hours capacity before it
started complaining about "you need to plug in to power soon".
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