During the last years Apple put a lot of effort making macOS more secure. As a result the compatibility with external devices such as GPS loggers wasn't always guaranteed. Some GPS loggers that did work on previous versions of macOS no longer work with current versions. As a developer of myTracks I try to support as many devices as possible. However, for some GPS loggers myTracks is dependent on third party drivers. Therefore I cannot guarantee compatibility of all GPS loggers for all versions of macOS.
Here is a list of GPS loggers that I tested successfully with macOS 10.15 and 11:
Some GPS loggers do no longer work with macOS 11: