I would bring my SPOT if I had one. MELLOW offered his to me a second time.
I ran it to Panama and back which was cool but the international ride and being solo somehow stacked the chores at the stops, especially the border crossings. I would be surrounded by "helpers" before I even got off the bike so the SPOT usually took a back seat in the priority list.
I declined JOE'S kind offer with appreciation, going with the understanding that one of us at least would have one and we'd be together generally.
Don't know about smart phone SPOT that works while the service is not available so I will be all ears with regard to that.
This is not a high priority for me but fully understand that others may feel differently.
I am going to know where I am with OSM offline maps on my GS3 phone.
Everyone else can have fun guessing.