gps receiver for humminbird ns25 fishfinder

[yukonstu]

im lokking for a receiver for ns 25 fisfinder

[yukonstu]

need a gps receiver for ns25 humminbird

[jonniesaxxx]

^{I know this is years old now, but thought I would mention I am after a GPS antenna for the NS25 system. I have some old gear I want to get running so if anyone has one lying in a box somewhere please let me know. I think it should say "GR3" underneath on sticker next to serial number. Thanks}