When the SPOT system receives a "Check In" or "Help" message, it will use the contact information settings that you entered to send notifications to your friends and family. The subject line of the email contains your unit number and if it is a "Check In" or "Help" message.
The email contains the full "Check In" or "Help" message that you setup for the messenger. The email also contains the serial number, the exact latitude/longitude location and a map link. Clicking on the map link will pop up a Google maps page that will show them your current location.
If you have added a mobile numbers as a contacts, they will also receive the notification. The format of messages sent to a mobile phones are almost identical. The exceptions are the inclusion of the Google map link and your GPS location.