Let me try to explain this in a different way; long-time users (Harry, et. 
atl.), feel free to correct me on any of this.

Erik, yes, you _can_ use the online map features for routing.  However, 
first please understand that the online map services are separate 
organizations from OsmAnd, and might not have recently-updated map data.  
Some are known to not update their map data for months, or even years.  The 
OsmAnd developers cannot make them provide more recent updates; they are 
simply different companies, each with their own goals.  Why are they still 
offered in OsmAnd?  Because many users still want the ability, even with 
outdated map data.

Within OsmAnd, the base World Overview Map is exactly that--an *overview* 
map of the world.  It only provides the most important highways as set in 
the OpenStreetMap database.  It does not include most local roads and 
streets, such as in residential areas where people live.  Using 3rd party 
data along with tools provided by the OsmAnd developers, you can generate a 
complete world road map with complete local road details, but the effort 
would take a few weeks, and require dozens of gigabytes of data..

In order to get the most capability from OsmAnd, you really do need to 
download the offline area maps (nation/country, state, region) where you 
live, and want to travel through/to, and use OsmAnd's internal routing 
function.  You can still use the offline maps with the online routers, and 
get a reasonably accurate route to your destination, but the offline maps 
are still needed.  For myself, I have found that the offline maps and 
OsmAnd's internal routing engine usually generate good navigation data, 
often comparable to specialized routing applications such as Waze (without 
the live traffic information that Waze and Google have access to).  Of 
course, OsmAnd's route abilities are totally dependent on accurate 
information in the OSM map database; I've encountered several situations 
where OsmAnd *shouldn't* have routed me a particular way, but the fault was 
in OSM, not OsmAnd.  And also, in several of those cases, a comparable 
route from Google also sent me down bad roads, because their map database 
also had poor data.  Then there's this recent routing fiasco in the United 
States from Google:  
https://denver.cbslocal.com/2019/06/27/google-maps-detour-drivers-muddy-field-denver-airport/

The OsmAnd developers are often tweaking their routing engine, and so 
sometimes the route generated by one version of the app may differ slightly 
from the one generated by another version, but they are usually similar.

--jack

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