I pulled in the data from the Garmin into Humminbird and it shows up as a breadcrumb track with no ability to navigate it.
No. You just need to edit the track on your unit and change its characteristics. You can change it to a bold line and choice a color.
Hit menu twice and select the Navigation Tab.
Select Waypoints, Routes and Tracks
Find, select your Track(you can also use Sort By if needed to help) and select Edit.
Then edit the track characteristics.
I find tracks easier for running navigation than routes.
Note: If you Restore Defaults you will lose your edits, but you can reedit(Bummer).