Mount combo (USB/COM) device

I've bought this simple navigator that works fine on PC using the software released by the company but there is no mac version for it. Under mac the navigator was supposed to be mounted as an external drive. But this doesn't happen.

I've left a question for the company support team, but it seems to be unlikely to get a proper answer. Is there any way to force it to mount as an external drive?

I'm using macbook pro running OS X Yosemite 10.10.2. When I plug in the device on USB, I can see this controller is up 'CP2102 USB to UART Bridge Controller' in the system details, but i have no idea what to do next.