I found out, actually by mistake when setting up another Toughbook, that the modem by default was installed on COM4, the port also being used by the GPS. Since the GPS was not active when the modem was installed, the modem assumed nothing was using that port and no conflicts were being reported. So, after applying the changes in the post above and checking to make sure the GPS is active and capturing a signal, uninstall the modem and then reinstall it. The new modem installation will create a COM7 for the modem and not interfere with the GPS. So, there it is. The solution to an age-old problem, the jumping mouse and GPS fix, that affect some users.