Standard Horizon GX2400GPS Owner's Manual page 27

The MMSI can be input only once, be careful not to input the incorrect
MMSI number. If the MMSI number needs to be reset, contact Standard
Horizon to obtain the required reset code. Refer to section "16.9.1 Reset
the USER MMSI and ATIS CODE".
Programming the MMSI
1. Press the [MENU/SET] key to display "MENU".
2. Rotate the DIAL/ENT knob to select "MMSI/POS
INFO", then press the [SELECT] soft key. (To cancel,
press the [BACK] soft key.)
3. The "MMSI INPUT" screen is displayed if the MMSI
has not yet been input.
When the transceiver entry has been completed, it is
only possible to check the MMSI on this screen.
4. Press the [◄] or [►] key to select the first number of
your MMSI, then press the [SELECT] soft key to step
to the next number.
5. Repeat step 4 to set your MMSI number (9 digits).
If a mistake is made entering in the MMSI number,
press the [◄] or [►] key to select "←" or "→", press
the [SELECT] soft key until the incorrect character is
selected, then perform step 4.
6. When finished programming the MMSI number, press
the [FINISH] soft key. The radio will ask you to input
the MMSI number again. Perform steps 4 through 6
above.
7. After the second number has been input, press the
[FINISH] soft key to store the MMSI.
8. Press the [OK] soft key to return to radio operation.
To check the MMSI after programming to ensure it is correct, perform steps
1 to 2. The current MMSI number is shown on the display.
WARNING
NOTE
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