Allows plotting a route to- ward a manual cursor posi- tion, desired marker, port, nearest port service or specified position (lat/lon). GOTO ? Navigation mode:Deletes the current route. CLR ? Navigation mode:Turns navigation data pages.? Cursor mode:Allows switching from Cursor mode to Naviga- tion mode. Enters a waypoint or a marker, or confirms a selec- tion from the menu. PAGE ENTER ZOOM+/ZOOM- Selects the chart range. Keyboard KEYBOARD ? Switches the GEONAVon / off.? Allows adjusting thescreen backlight.? Allows adjusting thescreen contrast. PWR ?Moves the manual cur-sor across the screen.?Allows switching fromNavigation mode to Cur- sor mode.?Allows selecting fromthe options in the menu /submenu.?At start-up, allowsadjusting the screen con- trast. CURSOR ? Cursor mode:Deletes the last waypoint or the marker pointed by the cursor. 16 Diagnostic NOTE PWR WARNING: The GEONAV features a diagnostic program to verify its cor-rect performance, once installed, and detect problems that may occur during the use of the unit. To access the diagnostic program, hold the DIAGNOSTIC : In case of damaged cartridge or abnormal power spikes, the unit might lock,requiring a power shutdown to restart. In that case, the unit can be turned off without the need of detaching the power or the batteries, but by simply holding the and CLR The internal memory can be cleared by pressing simultaneously the keys while holding the ENTER PWR key.The GEONAV will switch on and execute automatically thediagnostic program. After displaying the system’s software releases, it will start carrying out the memory test.As soon as the memory test is completed, the program willtest the NMEA 0183 port, the CompactFlash™, the external Gps device, the keyboard, the backlight, the LCD and the audio output. Press to run each test or CLR CLR ENTER to cancel the operation, or key pressed until the Erase backupprocedure message pops up. Press CLR to re-boot the unit. twice to exit.Once terminated all tests, press ENTER ENTER CLR to skip to thenext test.When testing the NMEA 0183 port, hold the key pressedto freeze on the screen the messages sent by the BOAT GPS device or the depth sounder, then release it to keep on displaying any new message.When testing the keyboard, press key pressed,while pressing the ENTER PWR EnglishEnglish keypressed for more than 9 seconds. 17 toconfirm it. This operation will delete all the settings stored in the GEONAV and restore factory settings.