Well, I finally sprung for the InReach SE and got a chance to test it out on Monday. I was doing some trail work down in Elbe Hills so I was in open areas for awhile and in some really thick cover; tall firs and thick maples. I set the unit to transmit a location point every 20 minutes. You can set it from every 10 minutes up to every 4 hours, depending on how many points you want to see and record.
The unit worked flawlessly all day and I retrieved the data map from the DeLorme web site when I got home. You can automatically have the map sent to anyone you have identified as a contact. In a twelve hour day transmitting points every 20 minutes, I think I used about 10% of the battery. For a long distance trek or where charging is not available, I would have the increments set to more like an hour or more. I would also look into a solar USB charger for an extended backpack trip. I plan to use it for a road trip, so I'm not too concerned about battery life.
I have it synced with my Android phone but haven't quite figured out how all that works yet. Here's a picture of the location point map from the web page:
