Here's a list of reviews of knot-tying books:
http://www.earlham.edu/~peters/knotlink.htm#bookstore
which includes sections on rope rescue knots:
http://www.earlham.edu/~peters/knotlink.htm#roperescuebooks
and climbing knots:
http://www.earlham.edu/~peters/knotlink.htm#climbingknotsbooks

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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)