This link will take you to many valuable free PDF publications.
https://msi.nga.mil/NGAPortal/MSI.portal;jsessionid=Wxhrh5nJFwWqQpqW16gW1HyRvb7hG1rT5QtNlCgCHNFJ3WGSh4c7!782266799!-1711492724?_nfpb=true&_st=&_pageLabel=msi_portal_page_62
This link will take you to useful web calculators.
http://www.starpath.com/calc/
Monday, May 14, 2018
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