Humminbird Tour Series - Manual (Page 27)

Units
The Units function allows the user to select the units of measurement
for the speed readout. Both MPH or statute miles per hour and KTS
or nautical miles per hour are available. Use the ARROW buttons to
highlight the desired selection. The Tour Series remembers this
selection even when the unit is powered off. Press MENU to go to the
next menu.
Fish ID
The next Option menu is Fish ID. There are three selections available; Off,
ID On, and ID+ On. The factory setting is ID+ On. With Fish ID Off, sonar
returns are displayed as "raw" information. There is no interpretation made
by the unit. Selecting ID Off, also will disable the fish alarm.
ID On enables the Tour Series to interpret the raw sonar data and, using a
variety of techniques, depict appropriate target returns as one of three
different size fish symbols. Further identification shows whether the fish is
in the left, center, or right beam.
ID+ On adds an additional piece of information to the location of the fish. The depth beneath the surface
for selected fish symbols is attached to the fish symbol.
Use the ARROW buttons to highlight the desired setting, and press MENU to advance to the next menu.
The unit remembers Fish ID setting when powered off.