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Trouble with Stakes & Scale

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Hey friends, looking for some ideas on what I've screwed up: trying to plot some GPS way points from a nautical map. We have known coordinates for several (12+) waypoints in Lat/Long format. I've set my file up to use Nautical Miles as the base unit (though this is likely where I've gone wrong?). Using georeferencing.

 

I'm getting a discrepancy of about 25% scale. Waypoints should be 2 miles and 1 mile apart respectively. When measured, theyre showing as 2.5 an 1.25 miles apart. This is consistent over all my points.

 

Have I screwed it up with the units, or my georeferencing somehow?

 

thanks

Screen Shot 2021-05-10 at 11.18.59 AM.png

Screen Shot 2021-05-10 at 11.18.53 AM.png

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