A surgical navigation system for navigating a region of a patient includes a non-invasive dynamic reference frame andor fiducial marker, sensor tipped instruments, and isolator circuits. The insert is formed from a sheet metal formed in a zigzag shape that forms a series of alternating impingement cooling channels with return air channels, where pressure side and suction side impingement cooling plates are secured over the zigzag shaped main piece. Also, programmable circuits including programmable logic devices, such as anti-fuses, are provided that are programmable to maintain the voltage at a magnitude to which it is adjusted. The braking apparatus also includes a lock, such as a brake or a pin lock, having open and actuated positions. The invention also includes a process for making such honeycomb structures. Consequently, the saturated magnetic flux density can be 2.