Keeping the cap_m13.dat file open, Go to the menu in S3D.
File/open
Open the Marine.dat in the SAFE FOLDER!!
YES! S3D will open multiple files as long as you use the File/open.
(Took me awhile to figure that out at first

)
Open Node 3 in the Marine.dat file.
Scroll WAY down to Node 1684
Hmmm cap_m13