This is an ordinary A-to-mini-B cable, it's not the special one you will need for the Holux GPS. You will need a cable with a built-in chip that acts as a USB to serial converter, because the GPS does not have USB functionality, they just used the same connector for charging and for plain serial data transfer. Here is the pinout of their USB jack:
I have the M-1200 and when I plug it in with this cable, it's not
recognized as a USB device at all.
Sewell refunded me for this, and say they will be removing this listing on Amazon.