Personal digital assistance (PDA) is set in a second low-power-consumption
(LPC) mode if its power switch is OFF, while the PDA is set in a normal
mode if its power switch is ON. If it is determined that the PDA is
connected to navigation equipment when the PDA is in the second LPC mode,
the PDA automatically switches to a first LPC mode in which the functional
blocks used for receiving position data from the navigation equipment and
storing the received position data are activated but the other functional
blocks are not activated. Then the PDA automatically receives the position
data from the navigation equipment and stores the received position data.
Thus the PDA can receive the latest position data without wasting the
power of the PDA, even when its power switch is OFF.
