I use the navigator 11 free edition on a device with winCE 5.0 core (Navgear GT-43 from Pearl) with a TMC Module from Royaltek (RTA 3000 Ro) connected via mini USB to Navgear GT-43.
According to RTA 3000 Spec 9600 bps are supportet; no details about COM are given. In the original Navi SW (IGO8) installed on the SD Card of the Navgear GT-43 device I have found the following settings: