The RYA certainly thinks so

RYA 1989/10
Redress may be given for a race committee's failure to provide suitably equipped marks.
In cases involving errors by the race committee, it is a good principle that any doubts be resolved in favour of the competitor.
SUMMARY OF THE FACTS
The outer limit mark of the finishing line was attached by cordage of a semi-floating variety which was too long when used ins hallow areas. The excess was usually tied into a bunch but it became loose.
It produced an underwater hazard floating two to three yards to leeward of the mark and, with a flood tide, on the course side of the finishing line. It was not visible to an approaching boat and several boats were caught in this tangle, hit the mark, took a one-turn penalty and re-crossed the line. Only one boat,
Instant Sunshine, requested redress, as the scores of the others were not affected. The protest committee, refusing redress, stated that the mark and ground tackle were the equipment used regularly as a finishing mark in that area and that the length and type of warp was not unreasonable in the circumstances.
Instan tSunshine appealed.
DECISION
Instant Sunshine’s appeal is upheld, and she is to be re-instated in her position when she first crossed the finishing line.
Marks are laid for the benefit of competing boats and it is important that ground tackle be arranged to minimise possibility of being fouled by the boats.
In cases involving errors by the race committee, it is a good principle that any doubts be resolved in favour of the competitor.


And so does Australian Sailing

 2025-04 Sail Port Stephens Matador vs PC-3 pdf 

Thanks John, I recalled something like that but had not been able to locate it.

Yes, it could be considered an error on part of the RC. However, granting redress would have to satisfy other conditions as well.

Have frequently given redress for this in match racing. 

I consider that it is possible to grant redress to the competitor in this case, given that the error in properly securing the mark’s line at the finishing line affected a large number of competitors.
Thank you

Jhon.
When the protest committee decides that a boat is entitled to redress under Rule 62, it shall make as fair an arrangement as possible for all boats affected, whether or not they asked for redress (RRS 64.2).
No????

Yes you have to be aware as a sailor, sense the problem in front and sail accordingly .

If you should have been aware of the problem, then there is some fault of your own, so no redress.

Watch though for reasonable marklaying, and the boat that almost hits the mark, so is excessivly close, catches the mark and claims redress.

These boats, should have redress refused.

We did give redress to boats with bulked keels at Chester Race week where they used 800 foot of floating poly in 600 foot of water who caught the line while passing 50 feet from the mark. The next day they had a counterweight

In our experience, fishing sinkers or other appropriate counterweights can prevent this scenario from developing.

This exact scenario happened at an A-Class Catamaran event in 2014, where I was the pin vessel. To shorten the line for finishing, we unclipped the buoy from its anchor / rode and clipped on a float (boat fender). The kellet weight was still attached to the rode, about 3 meters down from the float.  We then set the pin buoy closer to the signal vessel. Once everyone had finished, we pulled the pin buoy and clipped it on to it's original rode. This reduced the cycle time between races, as long as the wind direction was reasonably steady. 

Unbeknownst to us, the current pushed the float upwind, creating a loop of line that lurked just below the surface. The 2nd place boat snagged the loop with their T-foil rudder. They pulled the slack out of the line until it reached the kellet weight (a window sash weight). The weight flipped up and over the T-foil, bringing the boat to an abrupt stop. The "T" broke off in the process of freeing them.

They were awarded redress. Dave Perry was on the jury. I don't put anchors on floats anymore.

The RC must act the same way as sailors, in seamanlike way, so I think anchor lines should be in right angles, specially for keelboats with bulb. This is also very important for starting lines, when the port side is a boat or rib. The RC can use a weight to be sure that the line is under the water. 
Here in Brazil we have two keelboat classes, that have many issues with this situation, and always is given redress, unless if rule 31 is broken at the same time. 
Most of the Race Officers that do races with these classes already knows this matter and normally inform their marklayers to be aware of this, and use always weights near to the the marks tackle and have the right line lenght related to the depth where the mark is laid. 

Is it incorporated into the definition of room

With the redress, if the line was obciously slack on rhe first rounding, or you couls see someone before you catch it 

You may not pass the no fault test especially on later laps.

John wrote:
What rule says that a race committee must act in a seamanlike way?

The answer to your question lies in the definition of the word 'improper'.
Improper has 3 meanings:
- dishonest and against a law or a rule;
- unsuitable or not correct for a particular use or occasion:
- related to sex in a way that is rude or socially unacceptable.

Laying a mark so that boats cannot round it without fouling the anchor line is unsuitable or not correct for that particular occasion. Therefore, it is an improper action of the race committee.

If the improper action of the RC only affected the first 2 boats, why abandon the race? Redress can be given by awarding average pointed to the 2 boats without disadvantaging the other boats.

John, 
In a nautical context 'seamanlike' refers to behaviour or actions that are suitable or  correct for a particular use or occasion. 

If  the RC performs acts in a way that is unseamnlike or unsuitable or not correct for a particular use or occasion then that is an improper action - one of the conditions for redress.

Gordon where did you get the definition from?

I like it and using it i can think of some judgments that would have gone the other way.