It's not a large file or anything. Because it doesn't have any tracks on it you cannot download it to the app in the traditional way (the search mechanism within the app looks for tracks not waypoints). You need to go to the website and download the GPX file and then email it to your phone and open the attachment within your email program with DSM. That works with GMAIL anyway. You can also put the file the phone directly and open it with DSM that way. I linked to the map above so you can find it easily enough. Also, if you use the text search feature on the website you can search "hot springs" and find it that way.