Simrad RS20 User Manual page 38

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For some EU region radios only: Enter the ATIS ID number. Re-enter
number to confirm correct entry.
Enter vessel call sign if known, or skip to next step.
Set the time offset for your region. Choose whether to display time
in 12 or 24 hour.
MMSI and ATIS ID
The MMSI is a unique 9 digit number and the ATIS ID is a 10 digit
number. They are used on marine transceivers that have DSC (Digital
Select Calling) functionality.
•
An MMSI remains with a vessel, even if the vessel is sold on.
•
An MMSI has 9 numeric digits (xxxxxxxxx). Your MMSI must not
commence with a '0'.
•
A Group MMSI begins with '0' followed by 8 numeric digits
(0xxxxxxxx).
•
A Coast Station MMSI begins with 00 followed by 7 numeric digits
(00xxxxxxx).
•
By law, you are not able to change your MMSI once it is entered into
the radio. This is why there is the confirmation screen when entering
the MMSI.
•
An ATIS ID is only required in certain EU countries when navigating
some inland waterways. It is usually a different number to your
MMSI.
Installation | RS20 operator manual