Ronstan's All Purpose (AP) blocks use self-lubricating Acetal polymer sheaves with polished stainless steel races that allow these blocks to handle dynamic and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.
The 2021 edition includes up-to-date, consolidated text in line with amendments adopted up to 1 July 2021 and updated unified interpretations that have been keyed to relevant articles and regulations.
A single book providing a complete manual back-up for all celestial navigation needs. The content is identical to the United States Naval Observatory edition.
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