terminology question related to Shackles

A shackle (shot) of chain is the distance between Kenter Shackles on Studlink Chain. According to Class Rules this is 27.5m (90ft, 5o fathoms).
This means the chain is broken down into manageable lengths for manufacture and handling and these are joined together by Kenter Shackles. This also allows a vessel to replace a portion of their chain due to wear, corrosion or damage.
The Kenter Shackles are recognizable so it is possible to determine how much chain is out by counting the shackles.
It is quite common for yachts to paint the Kenter Shackles using a colour code to allow easy identification of how much chain is out. This varies per vessel, with different colours used or number of links painted indicating differentiating shackles. Most important is painting of the last shot of chain (warning shot) to ensure the user doesn't get to the bitter end.

Interesting. But wouldn't 90 feet be 15 fathoms? 50 fathoms would be 300 feet.

@Riknpat You are entirely correct - 15 fathoms per shot.
Tristan's videos are a good insight into working onboard a Superyacht. Thanks are also required to the owner of MY AWOL.

On commercial ships they always refer to it as a shot of chain. Each 90’ shot is connected via a detachable link. They paint each detachable link red and then a corresponding link of chain on either side is painted white. So the second shot of chain has two white links on either side of the red detachable link, the third shot has three white painted links, etc, etc. Ships normally carry 10 or 11 shots total. The second to last entire shot is painted yellow as a warning that they are nearing the bitter end. The last shot is painted entirely red. When anchoring the CAPT or Chief Mate will direct how many shots they want deployed.
There are some amazing videos on YouTube of runaway anchor chains on ships. Not a place you want to be if this happens.

I noted last month that AWOL has been sold - IYC Yachts/June 22 - but no info on future future plans for the now former owner or Tristan. I too have enjoyed and learned from Captain's VLOG and wish them all the best.