I used F3 for more than 2 years now, and I use the f3 for navigation very often. I plan my course on www.gpsies.com, also include my own tbt notification (water, refresh station, top of the hill, turn warnings etc.). After export from the webpage to TCX I use the TCXtoFIT converter from Runningbadger to convert the TCX to FIT file. This FIT I put to the Newfiles folder on the watch (www.gpsies.com ->TCX export -> TCXtoFIT converter -> FIT file to watch). And everything is working fantastic.
I have a question, if you create such FIT file and upload it to the F5, are the tbt notification working in case you select navigation on selected course?
Thank you for your answer.