Pierre,
You've already gotten some good answers, but thought I'd add my buttonology procedures (which Louise taught me!) and what I look at/for to make sure it's working.
For the shared page, concur with the others. Set it up once, and its where others can go to see your track. You can have them bookmark the site, and I actually bookemarked my wife's browser with the page to make it easier for her. You could also list the URL for your shared page in your "Check/OK" message, and the recipients could just click on the link to go to that page when they get the "Check/OK" e-mail. I ran out of characters to do that, as I said something like, "SPOT Check/OK. Launching in 15-30 mins. Follow me on my SPOT shared page. Second OK msg = arrived OK". I might redo that to add my SPOT URL, and maybe later the iPhone tracker URL, and maybe even the APRS URL (when I get one). Might not be enough characters allowed to do all that though!
My SPOT URL (FWIW) is:
http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0K4svVL7OeYGoHTqRNmPWsHJMk2PgTyYd
When I fly, I do much as Louise does. Wheel out the airplane, and as I start the preflight, I grab the SPOT, and push the ON button momentarily. I look to see the left green light flash. Once it flashes, I push the Check/OK button momentarily (for just about a second), and then look to see that both green lights flash after I let up on the OK button. Double-flash after a momentary push means the OK msg was/is being sent. I put my own cell number in the list of recipients, and I quickly get the "OK" text from SPOT, and thus I have a confirmation that it went out.
Then I put the SPOT back on the dash, do the preflight, man-up and taxi. As Louise said, normally by the time I get done with the run-up, the double flash from the OK msg has stopped, and I then push and hold the OK button until I see a double flash again while I'm holding the OK button down (normally takes about 7 seconds). This time the double flash means its in tracking mode, so I plop it back on the dash, and blast off. However, as has also been said earlier, if the original OK msg double flash is still going (fast preflight and taxi), I have to turn the unit off, then back on, then push and hold the OK button for that 7 seconds till I get the double flash while holding it, to enter tracking mode.
Sometimes I forget to start the tracking mode before takeoff, so I may add a checklist item to the end of my run-up checks, "Trackers-ON"...then into the before takeoff checklist, and blast off.
When I get to my destination, I turn the unit off, then on, and then send another OK msg (momentary push) to say, "I'm here". I then get a text again, and know that it went out the second time.
Hope I didn't beat that up too much!
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
It's actually very easy, and has worked very well.
Navy short version:
On (see left flash)
Momentary OK (see double flash after releasing OK button...OK msg sent)
Taxi/Run-up
Look for left flash only
Long OK (double flash while holding OK down...in Tracking)
If you'd like, add my number to your text list (7755443511 AT&T), and I'll let you know if I get the OK msg. Shoot me your shared page, and I'll watch you go out and play!
Have fun, and good luck!
Cheers,
Bob