Sending a Preset or Text message from an inReach device usually includes your current position, and should work fine with TrailInfo.org.
From the inReach SE and Explorer manuals:
Sending a Reference Point
You can send a message that includes a reference point with details about another location. This feature is helpful if you want to meet someone at that location.
Sending a Reference Point not found in the Mini / Mini 2 manuals.
If you want to know about another location, you’ll need the latitude and longitude in decimal degrees. Two decimal places, roughly 1 mile (1.6 km) maximum inaccuracy, should be close enough for these purposes.
You can click locations and get lat/lon with too many decimal places from google.com/maps, which is what I did for Bishop. Or figure it out the old fashioned way from genuine USGS paper topo maps. There’s probably a bunch of other ways.
— Rex