Humminbird Tour Series - Manual (Page 21)

POWER, powers the Tour Series up for normal operation. When the unit is on,
POWER turns the unit off. POWER can also be used to go directly into Simulator
mode. With the unit powered off, press and hold POWER for several seconds until a
continuous chirp is heard.
LIGHT controls the unit's 3-position display backlight. With the unit powered on,
pressing LIGHT once will turn the backlight on "high". Pressing LIGHT a second time
will turn the backlight on "low", and pressing a third time will turn the backlight off.
The backlight is very effective for low-light and nighttime operation. When the
backlight is on, the Tour Series will consume more power than with the backlight off.
This is important when using the Tour Series in a portable configuration powered by
a separate battery, or when powering the unit from a trolling motor battery.
NOTE: When powering the unit from a battery such as in portable applications,
avoiding use of the backlight prolongs battery life.
The three lower buttons, MENU, UP ARROW, and DOWN ARROW work together to control the Tour
Series menu-controlled user functions.
MENU brings a menu on-screen for adjustment. In normal operation, pressing MENU repeatedly will cycle
through all available menu headings. When the desired menu heading is displayed, the full menu appears
after a short pause. A menu remains onscreen for several seconds allowing user adjustment by means of
the ARROW keys. If no adjustment is made in the allotted time, the menu disappears. If you need the
menu to remain on-screen longer to study the adjustment options, press and hold MENU-the menu will
remain on-screen indefinitely. Once you release the menu button, the screen will time out.
Once a menu times out, it is still considered the active menu. Pressing MENU will bring up the last used
menu.
The UP ARROW and DOWN ARROW make adjustments to menu functions. On the left side of every
menu there are UP ARROW and DOWN ARROW symbols. The symbols indicate which ARROW button
has a function in a particular situation. Either one or both ARROW buttons can be used to adjust the
menu function. A hollow ARROW symbol means that the corresponding ARROW button has no function.
Pressing that button will result in no adjustment and the "error" audible will be heard. A solid ARROW
symbol means that the corresponding ARROW button can be used to affect the menu adjustment.
The ARROW buttons often can be used when no menu is on-screen. In these situations, pressing the
ARROW button affects the function of the active (last-used) menu. This is a short-cut to menu operation.
The menu appears onscreen while the adjustment is made and 'times out'. A frequently used menu can
be adjusted very quickly using this technique.
After an adjustment is made to a menu function, the menu "times out" after several seconds and the unit
returns to normal operation.