Navigation system, jig, and program

A jig comprising:

• a first jig including:
• an attachment portion configured to allow a sensor to be inserted in a predetermined orientation;
• and
• a surface having a shape corresponding to a surface of a bone on skull side to be joined;
• and
• a second jig including:
• an attachment portion configured to allow a sensor to be inserted in a predetermined orientation;
• and
• a surface having a shape corresponding to a surface shape of a bone on dentition side to be joined.

A non-transitory storage medium storing a program causing a computer to execute procedures comprising:

• acquiring information on a position and a posture of a first sensor detected based on a signal of the first sensor, and information on a target attachment position and a target attachment posture of the first sensor with respect to a position and a posture of a second sensor detected based on a signal of the second sensor, the first sensor being inserted into an attachment portion of a first jig, which has a surface having a shape corresponding to a surface of a first bone, in a first orientation predetermined with respect to the first jig, and the second sensor being inserted into an attachment portion of a second jig, which has a surface having a shape corresponding to a surface of a second bone, in a second orientation predetermined with respect to the second jig;
• deriving a first relative position and a first relative posture of the first sensor with respect to the target attachment position and the target attachment posture based on the target attachment position, the target attachment posture, and the position and the posture of the first sensor;
• generating a three-dimensional coordinate axis image representing the target attachment position and the target attachment posture and a three-dimensional coordinate axis image representing the first relative position and the first relative posture;
• and
• displaying the three-dimensional coordinate axis image representing the target attachment position and the target attachment posture and the three-dimensional coordinate axis image representing the first relative position and the first relative posture.