When a message has been created and it has to be sent to an address, the kind of message it is (e.g. fax, e-mail, TELEX, etc...) has to be specified. Also, the final destination for example, a fax number, has to be specified.
As for the way the message has been built up, the user has to determine if each character consists of 5, 7 or 8 bits. The more bits each character has, the higher the total number of bits the message contains, and so the higher the cost of the message. This information about the number of bits per character we have to use can be found in the user manual of the message terminal or it will be supplied by the provider of the LES you normally use. Some special characters will not be available within the 5-bit character set (the ITA-2 alphabet) e.g. the character @. For example, to send an email in 5 bits format, users should replace the special characters not available in the ITA-2 alphabet by a combination of characters that can be processed by the provider platform. E.g. valter_suban@gmail.com, should be written as: valter(u)suban(a)gmail.com.
All these items mentioned above can be created in an address book on the message terminal. These addresses can be stored (up to 100 addresses) so the next time you want to send a message to the same address, all you have to do is select it from the address book.

Practise on the Inmarsat C simulator

Adding an entry in the Addressbook:

• Press F3 to access the address book or choose Transmit and Spacebar in the address field (Alt,T,Spacebar) to enter the Address Book Window.
• Select 'New' in the menu bar using the arrow keys followed by 'Enter'.
• Type the name of the destination (e.g. Fax Maritime Institute) followed by 'Enter'.
• Select 'Fax" by using the arrow keys followed by hitting the 'Spacebar'.
• Go to the Number field by using the arrow keys and fill in the number 31562446601 (fax number (0)562-446601 in the Netherlands, country code 31).
• Select the bit size (e.g. 7 bit) of each character using the arrow keys followed by hitting the 'Spacebar'.
• Go to 'OK' by using the arrow keys followed by 'Enter'.
• Now the address will be stored and can be selected by choosing 'Select' in the menu bar using the arrow keys followed by 'Enter'.
  

Removing an already stored address can be done by moving to the address in the address list using the arrow keys, and then select 'Erase' in the menu bar using the arrow keys followed by 'Enter'.