A surgical equipment kit for a knee replacement or revision procedure comprising: a first inertial measurement unit having a gyroscope, an accelerometer, and a magnetometer; a second inertial measurement unit (173/274) having a gyroscope, an accelerometer, and a magnetometer; at least one of (i) a tibial patient-specific anatomical mapper that includes a surface precisely and correctly mating with a tibial surface in only a single location and orientation, where the tibial PAM is configured to be mounted to the tibial surface; and (ii) a femoral patient-specific anatomical mapper that includes a surface precisely and correctly mating with a femoral surface in only a single location and orientation, where the femoral PAM is configured to be mounted to the femoral surface; a cutting guide configured to be repositionably coupled to the at least one of the tibial PAM and the femoral PAM, the cutting guide including at least one of a cutting slot and a pin orifice, the guide configured to couple to the first IMU in a predetermined known position and orientation; and a mechanical connection comprising at least two joints (222, 226) to operatively couple the cutting guide to the at least one of the tibial PAM and the femoral PAM; wherein the second IMU (173/274) is configured to be operatively coupled to the at least one of the tibial PAM and the femoral PAM, wherein the at least two joints (222, 226) comprise a pair of revolute joints and a spherical joint. a first inertial measurement unit having a gyroscope, an accelerometer, and a magnetometer; a second inertial measurement unit (173/274) having a gyroscope, an accelerometer, and a magnetometer; at least one of (i) a tibial patient-specific anatomical mapper that includes a surface precisely and correctly mating with a tibial surface in only a single location and orientation, where the tibial PAM is configured to be mounted to the tibial surface; and (ii) a femoral patient-specific anatomical mapper that includes a surface precisely and correctly mating with a femoral surface in only a single location and orientation, where the femoral PAM is configured to be mounted to the femoral surface; (i) a tibial patient-specific anatomical mapper that includes a surface precisely and correctly mating with a tibial surface in only a single location and orientation, where the tibial PAM is configured to be mounted to the tibial surface; and (ii) a femoral patient-specific anatomical mapper that includes a surface precisely and correctly mating with a femoral surface in only a single location and orientation, where the femoral PAM is configured to be mounted to the femoral surface; a cutting guide configured to be repositionably coupled to the at least one of the tibial PAM and the femoral PAM, the cutting guide including at least one of a cutting slot and a pin orifice, the guide configured to couple to the first IMU in a predetermined known position and orientation; and a mechanical connection comprising at least two joints (222, 226) to operatively couple the cutting guide to the at least one of the tibial PAM and the femoral PAM; wherein the second IMU (173/274) is configured to be operatively coupled to the at least one of the tibial PAM and the femoral PAM, wherein the at least two joints (222, 226) comprise a pair of revolute joints and a spherical joint.