Selection method, positioning device and program

A positioning device comprising:

• a memory that is configured to store computer-readable instructions and data corresponding to a plurality of satellite positioning systems;
• a receiver that is configured to receive a locational signal from at least one of a plurality of satellites so as to determine a location of the positioning device;
• a battery that is configured to supply power to the positioning device;
• and
• a processor that is configured to execute the computer-readable instructions so as to:
• acquire support information from an external device, the support information including:
• identification information of the plurality of satellite positioning systems used by the positioning device;
• and
• identification information of at least some of the plurality of satellites captured by each of the plurality of satellite positioning systems used by the external device;
• detect a battery level of a battery in the positioning device, the battery supplying power to the positioning device;
• select at least one of the plurality of satellite positioning systems based on the battery level and the support information;
• and
• receive satellite signals from the some of the plurality of satellites associated with the selected at least one of the plurality of satellite positioning systems,
• wherein the processor is configured to set an order of priority for selecting one or a combination of two of the plurality of satellite positioning systems,
• when the battery level is equal to or more than a threshold, a highest rank in the order of the priority is a largest number of the plurality of satellites captured by the one or the combination of two of the plurality of satellite positioning systems, and
• the processor is configured to select at least one of the plurality of satellite positioning systems corresponding to the highest rank.

A computer program product embodying computer-readable instructions stored on a non-transitory computer-readable medium for causing a computer to execute the computer-readable instructions on a processor so as to perform the steps of:

• acquiring support information from an external device, the support information including:
• identification information of a plurality of satellite positioning systems used by the external device;
• and
• identification information of at least some of a plurality of satellites captured by each of the plurality of satellite positioning systems used by the external device;
• detecting a battery level of a battery in the positioning device, the battery supplying power to the positioning device;
• selecting at least one of the plurality of satellite positioning systems based on the battery level and the support information;
• receiving satellite signals from the some of the plurality of satellites associated with the selected at least one of the plurality of satellite positioning systems;
• and
• setting an order of priority for selecting one or a combination of two of the plurality of satellite positioning systems by causing the computer to execute the computer-readable instructions on the processor,
• wherein when the battery level is equal to or more than a threshold, a highest rank in the order of the priority is a largest number of the plurality of satellites captured by the one or the combination of two of the plurality of satellite positioning systems, and
• the processor is configured to select at least one of the plurality of satellite positioning systems corresponding to the highest rank.