Terminal device and guidance program

A guidance program on a non-transitory computer-readable storage medium for a terminal device that provides guidance corresponding to a current position on map data, the guidance program operable for causing a computer to execute:

• current position acquiring function of receiving radio waves from GPS satellites and acquiring the current position on the map data;
• blocking area acquiring function of acquiring a blocking area in which radio waves from the GPS satellites are not receivable, the blocking area corresponding to the map data;
• guidance function of providing guidance corresponding to the current position, and in a case in which the terminal device is moving on a road in the blocking area and the road has a branch, suspending the guidance corresponding to the current position;
• physical amount estimating function of estimating a physical amount in the blocking area, the physical amount being convertible to a movement distance;
• and
• movement road determining function of determining a road on which the terminal device is moving after the branch in the blocking area, on the basis of the estimated physical amount and a reception condition of radio waves from the GPS satellites.