I recently purchase the Holux gr-213 gp mouse device for use with my mobile weather platform , and it work very well , with the notable exception of the installation . I run Windows Vista Home Premium x64 edition , and the installation only support 32-bit system . slightly disappointed , I need to run around the internet and install another serial driver to even interface with the device . I end up use the `` prolific usb-to-serial comm Port '' driver , and now the device work perfectly and be fairly precise . it be very compact , and have a long usb cable for placement wherever you need it , and , as advertise , be waterproof . it have a very good lockup time , range from a few seconds to around 10 seconds . it provide programmer with plenty of information , include you gp position , sattelite position , altitude , speed information , and much more . all in all , this be a very good device , and I do advise any consumer to purchase it .