Last week-end I went on a trip to Gaspésie with a friend, we drove 1865 kilometers in 3 days. My routine with the SPOT is to send a OK message in the morning before hitting the road, then I activate the tracking, I send another OK message at the end of the day when I stop driving and I shut it off.
When it sends a message the light stays on for 5 sedconds, I try to catch the first one to know at what time it's sent and then I can check at regular intervals to see if it sends message.
Here's my SPOT shared page for this trip.
http://share.findmespot.com/shared/faces/viewspots.jsp?glId=03DVtvxmlIQkj1pIYIbGVYFJjci5EOkvu
We drove about 8-9 hours a day for each of the three days but I only got 44 messages including the 6 or 7 OK messages that I sent.
On Saturday I only got 12 track messages over a 9 hours drive. I understand it needs a clear view of the sky but what bothers me is that I'm almost positive that I saw it sending more than 12 messages. I don't have a clear explanation of why I only see 12 on the SPOT page but my guess is that it's possible that the trees didn't block the signal in but blocked the signal out.
In other words, the SPOT was seeing the satellites signal and was able to calculate it's position and send the track messages but its outgoing signal wasn't strong enough to get out and be picked by the satellites.
That bothers me a lot because I don't know if I can trust the SPOT in an emergency situation. I can picture myself waiting for help, seeing the light confirmation on the SPOT that it's sending the 911 message but wondering if the satellites picked them up.
It could be fatal to wait for help that's never gonna come because one wrongly thinks that someone's on the way.