Hi Tommy,
at the moment only GPX v1.0 files are supported directly.
With v2 there will be more options.
Until V2 is launched, you have the option to convert your Suunto file via GPSbabel.org into GPX v1.0 files.
An explanation of how to do it can be found here:
https://forum.windsporttracker.com/t/how-to-use-data-from-garmin-devices/112
does this help?