Heads up on default navigation app change

[Scott Murray <scott.murray@xxxxxxxxxxxx>]

Just a heads up, a change recently was merged to master to change the
default demo navigation application in the agl-demo-platform images to the
newer "ondemandnavi" app.  This had been intended for a while, but a stray
over-ride of the PREFERRED_PROVIDER_virtual/navigation variable remained
that was forcing the use of the old application.

There are a few things to note about the new navigation application.
The first is that since it uses the Mapbox (https://www.mapbox.com/) API
to pull down maps, using the application requires setting a Mapbox access
token.  In target images, this can be done by setting the mapAccessToken
field in /etc/naviconfig.ini.  To set that value during a build, set the
variable MAPBOX_ACCESS_TOKEN_pn-ondemandnavi-config in site.conf or
local.conf.  An access token may be obtained by registering at:

https://account.mapbox.com/auth/signup/

Once an account is created, a default access token will be created that
can be used, or you can create others.

The second thing to note is that the application now needs an Internet
connection to be able to access the Mapbox APIs and download map tiles.
If an offline demo is required, switching back to the older application
may be done by setting PREFERRED_PROVIDER_virtual/navigation to
"navigation".

The third thing is that this application does not currently work with the
cluster demo.  Work is starting to enable that, the goal is to have it
before Halibut is released.

Scott

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