The message
from Al D contains these words:

Of course.. but if the anchor line breaks, it won't be the end of
the canoe; it just means I'm no longer at anchor (which could be
hazardous in some situations). Galvanized chain does cost... (£3 a
meter) (20 meters = £60).

Stainless chain?
http://cgi.ebay.co.uk/10-MTRS-6MM-ST...temZ4650288374

This bloke
http://stores.ebay.co.uk/Boat-Chandl...QQftidZ2QQtZkm
has stacks of stainless chain in many sizes - 4mm is probably thick
enough and that's £2.85/meter. Smooth - no snags like galvanised.

--
Skipweasel
Pay no attention to that man behind the curtain.