I have been helping a friend calibrate his new ghost. He is a long time MK user, but this is his first TM with spotlock. We have performed both the bow mount offset and heading sensor calibrations. We are not completely convinced the heading sensor calibration is correct as the TM wanders and "overcorrects" quite a bit when spotlocked. A concern we have is when going thru the calibration steps, the instructions state we should be hearing different sounds in addition to seeing lights flash, when entering the calibration mode as well as various sounds to let us know if the heading sensor calibration sensor was successful. We have yet to hear any sounds, but the lights do flash. I suggested he phone Lowrance and speak to support, which he did a couple days later. According to my friend, the support person told him to not worry about not hearing any sounds as that was not important and furthermore that he should simply keep going thru the calibration steps as sometimes it takes multiple tries to get it calibrated. When other users on this board have calibrated, have you experienced anything like this?