I have an Ultrex as well, non link. The spot lock works great most times, to be honest I've never tried the jog feature. I have had to re calibrate mine a few times and update boat scale and what not. If I'm not mistaken with the link function you could just place a way point and choose to "go to" so that may be the easiest option. I'm guessing it's something simple and being over looked and would be curious as to a follow up on your findings. These motors are also critical of speed settings, water conditions and so forth on how they respond.