2 Basic Operation
Overview of the keys
ESCAPE - Go back to an earlier menu or display. In chart mode, centres chart at boat’s position.
DISPLAY - Show a menu of the main displays. To go to a display, select it from the menu (see section
CURSOR KEYS - to move the cursor or the selection highlight.
MENU - Show a menu of the options for the current window.
Press again to display the Setup menu (see section 17).
ENTER - Start an action or accept a change.
ZOOM - Chart window: Zoom in or out to display different areas and detail on the chart.
Sonar window: Change the depth range displayed.
FAVORITES - Allows you to quickly switch between your saved favorite displays.
MOB - (Man Overboard, see section
POWER - Turn 657 on and off (see section
2-1 Using the keys
In this manual:
Press means to push the key for less than a second.
Hold means to hold the key down.
The internal beeper beeps when a key is pressed (to disable or enable the beep, see section
Using the menus
Operate the 657 by selecting items from menus. Items can be submenus, commands or data.
Selecting a submenu
A after a menu item indicates a submenu, for example Chart . Press or to move the
highlight to the submenu, then press .
Starting a command
Press or to move the highlight to the command, for example Goto cursor, then press .
10 | Northstar Explorer 657 Installation and Operation Manual |