A mobile terminal comprising: a GPS receiver circuit configured to determine location of the mobile terminal using GPS signals; a controller circuit configured to repetitively switch power-on and power-off to the GPS receiver circuit, and to regulate the power-on to power-off duty cycle of the GPS receiver circuit in response to distance that the mobile terminal has moved from a previously determined location an accelerometer circuit comprising at least a two-axis accelerometer to sense acceleration in at least two directions that can be parallel to a least a two dimensional direction of travel of the mobile terminal that generates acceleration information which is indicative of acceleration of travel of the mobile terminal; and an acceleration-based position determination circuit configured to determine a present acceleration-based location of the mobile terminal using the acceleration information from the accelerometer circuit during the power-off cycle of the GPS receiver circuit, wherein the GPS receiver circuit is configured to detect that the mobile terminal is GPS isolated in response to insufficient GPS signal strength to determine location of the mobile terminal during at least a threshold length of time, and wherein the mobile terminal is characterized in that: the controller circuit is configured to power-off the GPS receiver circuit in response to detecting that the mobile terminal is GPS isolated, to extend duration of the power-off cycle of the GPS receiver circuit until a distance between the present acceleration-based location and a previous GPS-determine location of the mobile terminal, which immediately preceded another location of the mobile terminal at which the mobile terminal was detected as being GPS isolated, exceeds a threshold distance, and to attempt to determine a present GPS-determined location of the mobile terminal upon powering-on the GPS receiver circuit and in that: the controller circuit is configured to repetitively switch power-on and power-off to the GPS receiver circuit, to regulate the power-on to power-off duty cycle of the GPS receiver circuit in response to distance that the mobile terminal has moved from a previously determined location, to decrease the power-on to power-off duty cycle of the GPS receiver circuit in response to discovering signals from a WLAN device and/or a Bluetooth device associated with a previously determined and/or defined location where the mobile terminal remained substantially stationary for at least a threshold time. a GPS receiver circuit configured to determine location of the mobile terminal using GPS signals; a controller circuit configured to repetitively switch power-on and power-off to the GPS receiver circuit, and to regulate the power-on to power-off duty cycle of the GPS receiver circuit in response to distance that the mobile terminal has moved from a previously determined location an accelerometer circuit comprising at least a two-axis accelerometer to sense acceleration in at least two directions that can be parallel to a least a two dimensional direction of travel of the mobile terminal that generates acceleration information which is indicative of acceleration of travel of the mobile terminal; and an acceleration-based position determination circuit configured to determine a present acceleration-based location of the mobile terminal using the acceleration information from the accelerometer circuit during the power-off cycle of the GPS receiver circuit, wherein the GPS receiver circuit is configured to detect that the mobile terminal is GPS isolated in response to insufficient GPS signal strength to determine location of the mobile terminal during at least a threshold length of time, and the controller circuit is configured to power-off the GPS receiver circuit in response to detecting that the mobile terminal is GPS isolated, to extend duration of the power-off cycle of the GPS receiver circuit until a distance between the present acceleration-based location and a previous GPS-determine location of the mobile terminal, which immediately preceded another location of the mobile terminal at which the mobile terminal was detected as being GPS isolated, exceeds a threshold distance, and to attempt to determine a present GPS-determined location of the mobile terminal upon powering-on the GPS receiver circuit and in that: the controller circuit is configured to repetitively switch power-on and power-off to the GPS receiver circuit, to regulate the power-on to power-off duty cycle of the GPS receiver circuit in response to distance that the mobile terminal has moved from a previously determined location, to decrease the power-on to power-off duty cycle of the GPS receiver circuit in response to discovering signals from a WLAN device and/or a Bluetooth device associated with a previously determined and/or defined location where the mobile terminal remained substantially stationary for at least a threshold time.