How to use GPX/TCX files with Garmin, android & iphone
TCX File - What is a .tcx file and how do I open it?
GitHub - adammendoza/Garmin-TCX-Builder-Mac-Swift: This is a utility program to create your .tcx file from a Garmin GPS when the unit fails to build one for you.
Convert Garmin 705 Navigator TCX Format using LINQ to XML and Data Objects - Article 1 - Peter Kellner