The issue with the Garmin 60csx is that it does not accept .gpx files directly.  That is why you'd have to use a 3rd-party program, as HHL noted above, as an intermediary - to convert the .gpx file into a format that your 60csx can consume.   There were a lot of discussions about this when the Send to GPS button was removed, so a search of the forums might be helpful.  But there was also this post in the  Release Notes (Website: Downloading caches to GPS devices) - August 28, 2018  thr