Route Calculation Error

I use a Garmin Edge 705 for training and exploring new rides and climbs.
One of the benefits of the 605/705 devices is they mount as a mass storage device allowing the GPX routes to be manullay copied over to the device without needing any other software. However, when I would try to navigate a manually copied route created with Marengo GPS Route Planner I would get the following error message:

Route Calculation Error: No roads near starting point

Routes transferred via Mapsource would work fine. One difference between the original GPX files and the route transferred viaa Mapsource is each of the route points < rtept > included extra xml child nodes

<extensions>
<gpxx:routepointextension>
<gpxx:subclass>000000000000ffffffffffffffffffffffff</gpxx:subclass>
</gpxx:routepointextension>
</extensions>

After adding the extension nodes to each route point in my Marengo created GPX files I can manually copy the GPX and navigate them without receiving an error message.