Help needed with Garmin 800

I have been using my garmin without any issues but yesterday I experienced a problem.
I had created a route with MapMyRide which I then downloaded to my Garmin as I've done with other routes in the past.
The problem was that I was 1/3 into the route when I decided to use the Garmin to give me turn by turn directions. The Garmin asked if I wanted to Navigate to the start of the route which I didn't want to do. It found my location and followed my progress along the route but did not give any directions at all, in fact, I took a wrong turn on purpose and there was no a warning either.
Can't the Garmin give you turn by turn directions if you don't start the rout from the starting point?
The file was a gpx converted to tcx - done a few times in the past without any problems.
Any ideas of what I might have done wrong would be very welcome.
I had created a route with MapMyRide which I then downloaded to my Garmin as I've done with other routes in the past.
The problem was that I was 1/3 into the route when I decided to use the Garmin to give me turn by turn directions. The Garmin asked if I wanted to Navigate to the start of the route which I didn't want to do. It found my location and followed my progress along the route but did not give any directions at all, in fact, I took a wrong turn on purpose and there was no a warning either.
Can't the Garmin give you turn by turn directions if you don't start the rout from the starting point?
The file was a gpx converted to tcx - done a few times in the past without any problems.
Any ideas of what I might have done wrong would be very welcome.
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Posts
Did you change the course settings to have turn guidance on? By default they are usuallly off.
Post a screen shot of the settings for the particular course.
To turn Screen Capture on:
Touch the Setup men (tool icon)
Press System
Press Display
Press Screen Capture
Select On
Press OK (or ) on message screen
Winter - Trek Madone 3.5 2012 with UDi2 upgrade.
For getting dirty - Moda Canon
Of course..... I forgot that little step Dohhhh.
Cheers for that - I feel so stupid now