someone wrote this in another forum regarding a similar problem:

"Maybe you already know this, but loading GPX files containing tracks is 
not going to result in any device giving you turn by turn instructions. The 
tracks are nothing more than breadcrumbs dropped on a map and the GPS has 
no knowledge if you're following them or not. Tracks can be converted to 
routes in Basecamp to get turn by turn guidance but I've never felt the 
need to do that even having ridden many thousands of miles with track 
guidance over the past couple of years.

We rode over 6,000 miles of the TAT and over 2,000 miles of my own track 
route from Georgia to NY - all just using tracks loaded in Garmin Zumo GPS 
(actually BMW Nav IV and NAV V devices). 

Anytime you introduce routing/rerouting into your guidance you run the risk 
of the GPS sending you somewhere other than where you precisely wanted to 
be. You can fix that with via points but if your track-->route conversion 
is for a long distance, that's going to be a lot of hassle to check it all 
along the way. You'll have to decide for yourself if it's worth it.

I thought you CAN get turn by turn on a gps track???



On Sunday, November 27, 2016 at 2:20:27 PM UTC-5, Mo Re wrote:
>
> I must begin by saying I dug through the reviews and specs of a few 
> android apps and tried to filter down to the best and this is the best 
> imho.  Only Backcountry navigator has more map options but it is more 
> complex and will not do turn by turn routing at all.
>
> OsmAnd+ 2.4.7 android, navigation set to car and offline vector maps 
> loaded of 2 states I was traveling.
>
> So I began a motorcycle trip yesterday morning by navigating to a gpx 
> track I had imported.  See attached.  When I got close it started sending 
> me around in circles?....one way then the next...it was soo strange....then 
> it said "in 1 mile make a u-turn" when I could have done it right there as 
> I was on a 20' wide gravel road???...then I ended up turning of turn by 
> turn and following the dot to the the track line which was not precise and 
> had be backtracking a few times for mised turns.
>
> 1.  Is this just the fact that the gps track is using many dirt roads and 
> not paved?
>
> 2.  Is osmand just not good with turn by turn routing to an imported gpx 
> track?
>
> 3.  Is there other software, plugins or modes that can do this 
> better???...I can live without the voice guidance if the display is correct 
> in showing at least a rough estimate of how far to next turn and turn 
> direction?
>
> 4.  Is there anywhere that explains the other navigation services, ie 
> YOURS, OSRM, Straight Line and if they are useful and work offline?
>
> tia,
>
>
>
>
>

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