Anchor Chain Size and Length

Jose Venegas

I am getting ready to replace my current anchor chain.   The chain that was installed by the yard 7 years ago tends to jump when enough force is made by the windlass, which I imagine is because is not the exact size for the original windlass on Ipanema. 
First question: Do you know what size chain should be used?  I am still going to buy a sample before getting the full length to make sure it fits well, but I may save time and money if I try the proper one first. 

A second question: how long (meters or feet) of chain are recommended for long distance cruising.  I find that 100 meter is too short and restricts the anchorages I can use. 

Jose Venegas
Ipanema, SM2K 278

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