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.
This famous set of mathematical tables first published in 1803 with all the tables required for coastal and deep sea navigation. An essential requirement for anyone learning and practising astro-navigation.
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