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 "heck-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 set up a mobile destination as one of the contacts, they will also receive a notification. The format of messages sent to a mobile phone is almost identical, except that the google map link and nearest location are not included in the message.