Report London boaters fight for moorings in General Boating Posted 2 hours ago 30 minutes ago, waterworks said: Bylaw 28 ( I don't have a cut and pasteable copy ) says obstruction of navigation not mooring, that's open to interpretation what the exact definition of " navigation" is, certainly what you claimed is an interpretation. Mooring a craft for a short duration (overnight?) in the course of navigation is a basic requirement unless you have a 24 hour crew available. I would wager that even back in the day of commercial carrying people did tend to moor the boat up for the night. Obviously not always but it sort of makes sense that this would happen, especially on number ones. Most people don't have 24 hour crew on canal boats these days and it would be unreasonable to expect this. Therefore using a mooring for longer than one night is effectively obstruction of the navigation because it prevents others using the mooring as part of the process of navigating a vessel along the waterway. If towpaths were restricted to 24h stops it would work a whole lot better but they aren't so it doesn't.