User's Manual

AIS Class B Transceiver
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To turn the AI50 off, press and hold the PWR/ key for a few seconds.
3.3 Navigation Keys
The circular 8-way NavPad, (Fig. 3.1 Item 1) can operate in a variety of
ways depending on which mode the unit is in.
3.3.1 Display Mode
The ▲▼◄► keys are used to position the cursor around the screen. By using
a combination of keys, for example, pressing the ▲ and the ◄ together, the
cursor will move diagonally up and to the left.
3.3.2 Menu Mode
The ▲▼ keys are used to highlight menu items before selecting them.
The ► key is used to select a new menu item, or go further into an item’s
sub menu. A single press of the ◄ key returns you to the previous menu
or mode. Press and hold the ◄ key returns you to the Display Mode
3.3.3 Data Entry Mode
During data entry, the ▲▼◄► keys are used to highlight characters and
numbers before using the  MENU key to select them.
3.4 Zoom Keys
In Display Mode the key has two functions:
A short single press, will increase or decrease the range shown in the
display about your current position.
Press and holding, will increase or decrease the range shown in the
display about the cursor.
3.5 ENTER/MENU
Pressing the  MENU key in any display mode, will select “Menu Mode”
and display the menu in the top left corner.
When navigating within a menu, once an item has been highlighted,
pressing the  MENU key will select that item or sub menu.
When in data entry mode the  MENU key is used to enter that data into
the systems memory.