I have a hook 7 Lowrance unit and I have gps quartnants. How do I put them into gps units and mark on map so when I go fishing they are already marked

Captain paul I was told of a pass called (tangefine pass) may be mispelled located east side main pass on mississippi river south of venice la. I was not able to locate on my map I have. If you could pinpoint for me it would be of big help. Thanks