I'd say this fits into survival...
About a year ago my seatbelt latch quit working. I fixed it with 550 cord and a carabiner. PITA to loop the seatbelt through the carabiner every time, but I'm glad I did. I passed out last night while driving. (they still don't know why, but my PB was very low.) Took out a utility pole, and caved in the side of a warehouse to a seed company. My 550 cord mod held!
Before:
http://i219.photobucket.com/albums/c...psgyab83lm.jpg
The crash:
http://i219.photobucket.com/albums/c...pshtc1dadv.jpg
http://i219.photobucket.com/albums/c...psms36vv20.jpg
http://i219.photobucket.com/albums/c...psblceyil6.jpg
http://i219.photobucket.com/albums/c...psmplxv4xl.jpg
My beautiful 550 cord modification that held me in safe:
http://i219.photobucket.com/albums/c...psgmfy8lwh.jpg