Abstract: A data search apparatus (200) for searching a general data list for desired spot data indicating a desired spot, the general data list comprising: original data (211) including a plurality of original spot data each indicating a spot on a map; and difference data (212) including at least one update spot data indicating an updated spot that is updated on the basis of the original data, said data search apparatus comprising: a first acquirement device (201) for acquiring at least one of the plurality of original spot data; a second acquirement device (202) for acquiring the update spot data from the difference data; and a data output device (203) for combining the update spot data acquired by said second acquirement device with the original spot data acquired by said first acquirement device and outputting the combined data including the desired spot data.

Abstract: In a mobile system, a power supply switch 34 receives the output from a clock 33 and a CPU 1, and selectively supplies the power supplied from the Bup line to position measuring means comprising a GPS receiver 4, a GPS antenna 5, a gyro 6, and a transit distance sensor 7 via a stabilizer 35, enabling the position measuring means to continue the position measuring operation after stopping the main operation of the mobile system.