Does anyone have one of these?

Is it possible to input co-ordinates into the gps and create a way point. I only know how to mark points once I'm actually there. But I have this wicked Nautical Satellite Imagery program that can give me co-ods, so I then want to input the co-ods into the gps and let it set a course for me to get there?

I hope this makes sense...

Thanks