The first map shows SFM located somewhere notheast of Australia, around 20ºN. The second map, however, shows SFM at a different location, south of the African continent about 40º-50ºS. My conclusion is that SFM is not an acronym for a place on the map. It may be the mapmaker's initials.

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Carbon reinforced fibers have been produced on an industrial scale and used as reinforcement in plastics since the mid seventies. They are made up of over 90% pure carbon.

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I am reading the book A Voyage for Madman by Peter Nichols. There are some maps on some pages. On those maps, I see the acronym "SFM" and have no idea what it means.

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Due to their high modulus of elasticity, carbon fibers are ideal for applications in which rigidity is the predominant requirement. While glass and aramid fibers offer high electrical insulating properties, carbon fibers are electrically conductive. However, unless the compound has been designed specifically for electrically active applications, the conductivity of carbon filled materials should not be relied upon to be consistent throughout the material. Compared to glass fibers, carbon fibers are very suitable for use in slide wear and low friction applications. Their characteristics support sliding movement and they significantly improve abrasion resistance.

I looked SFM up on Google and I found lots of stuff about Source Film Maker, which is a software. I don't think this is what it means here...