https://www.gpscity.ca/us-globalsat-br-355-s4-sirf-star-iv-serial-gps-receiver
and
https://www.gpscity.ca/us-globalsat-serial-pc-data-interface-cable-for-usglobalsat-products
or
https://www.radioworld.ca/usglobalsat-br305-rs232
Personally, I would just cut the end off and wire it myself. (Black - Ground, Red - 5V, Green - Tx)