I helped a buddy run a used sailboat that he bought in Seattle up to SE Alaska where we live. We had a SPOT and punched it in each day to let the wives know where we were.
It was about the only way besides a sat phone to post our position, as there was no cell phone coverage most of the time, and it was way too far to use VHF radio that we had.
The women would get the position each night and then go to google earth and find the aerial view of that location. (Of course the google image was taken some time earlier, so we weren't in the picture, but at least it helped them to see what route we were taking).
This was especially helpful when we had mechanical trouble and had to rely on sailing to get to the next town. They could tell we were still punching the button each day, just not moving very fast.
We also had a dual frequency EPIRB with GPS that we could activate if we were needing a rescue, which is another gadget to consider if you are getting off the beaten path...mine is handheld, about the size of the SPOT. It gives a signal to a satellite to relay to the rescue network with a GPS position, plus it broadcasts on another frequency a homing beacon (that the Coast Guard or whoever) can follow right to you. In theory, anyway; I have not tried it out yet!!
This stuff beats hollering quite a bit.