Who should be the watcher?

Someone dry, warm, sober and attentive with a phone. Rotate the job so everyone gets to swim.

How do I handle a swimmer who wants to stay in?

Agree the turn-around beforehand and let anyone leave early without comment. Swim Ireland's page says to wear a watch to track time.

What if a swimmer is shivering and confused?

Treat it as an emergency, call 112 or 999 and ask for the Coast Guard if they are in the water, and keep them dry and wrapped up.

Sea Swimming Group Etiquette and Shore Watchers

Q: Do I need a shore watcher?

The Coast Guard advises having someone on shore who knows your plans and can watch your progress, and Swim Ireland says not to swim alone.

Good group etiquette is mostly safety by another name. Agree a plan before anyone gets in, keep to the pace of the slowest, leave one person ashore who knows the plan and can see you, and treat the place as shared with other beach users. The Irish Coast Guard, RNLI and Water Safety Ireland all say never to swim alone, and the Coast Guard asks swimmers to have someone on shore who knows their plans and can watch their progress.

That advice applies to an informal dip with friends as much as a club session. What changes with a larger group is that nobody is automatically responsible, so someone has to be.

Before anyone gets in

Agree the route and the turn-around: where you are swimming to, which way, and when everyone is out. Stay parallel to the shore, as the Coast Guard and Swim Ireland both advise.
Agree a signal: how a swimmer asks for help and how the shore watcher asks swimmers to come in. A whistle is a common option; Outdoor Swimmer's night swimming piece suggests agreeing a signal beforehand.
Check the conditions together: weather, tide, water quality notices, jellyfish alerts. Swim Ireland's open water page says to listen to advice from officials on weather and water conditions. The Coast Guard and others say that if the water looks rough, murky or unpredictable, do not get in.
Allow anyone to say no: with no explanation. Everyone should stay within their own limits. A group that pressures a member to go in has already failed on safety.
Know who is new: newcomers should get a buddy and a shorter plan.

The shore watcher

The Coast Guard and RNLI's message to open water swimmers is to have someone on shore who knows your plans and can watch your progress. The January 2026 appeal repeats it as having a colleague monitor your activity. A shore watcher is the person who notices first.

Role	What it involves
Stays dressed and warm	A cold watcher is a poor watcher. Wear layers and stay dry
Knows the plan	Route, turn-around time, who is in the water, who is new
Keeps eyes on the water	Counts heads regularly. Does not drift into scrolling a phone
Has a phone with signal	Knows to dial 112 or 999 and ask for the Coast Guard if someone is in trouble
Has rescue basics	A throwable float or ring, if available. The RNLI advice is call, tell and throw, not swim out
Handles the aftermath	Has dry robes, hot drinks and a plan for rewarming a swimmer who is shivering badly

Rotate the job so everyone swims, and agree handover before the new watcher takes over. A watcher who is also trying to take photos, run a chat and look after a dog is not watching. For what to do if someone is in trouble, see what to do if someone is in trouble in the water.

Formal sessions have formal cover

Swim Ireland's open water page points to its Safe Supervision Guidelines for the safety cover required and recommended at club or coached sessions. An informal group of friends is not covered by those guidelines, so build in your own cover and do not assume a more experienced member is acting as lifeguard.

In the water

Keep together: the group's pace is the slowest swimmer's. Faster swimmers can swim loops and circle back, which is advice from a swimming magazine for events but works for dips too.
Be visible: bright caps and tow floats are recommended by the Coast Guard and RNLI.
Watch each other: know who is slowing, going quiet or shivering. Cold and tired swimmers can deteriorate fast.
Leave early without fuss: cut a swim short if you are tired, cold or unwell. Swim Ireland's open water page tells swimmers to wear a watch to track time in the water. Do not turn it into a competition for minutes.
Give space: avoid kicking or swimming into others, and rest on your back if you need to stop rather than treading water in someone's path.
Stay clear of boats, kayaks, jet skis and anglers: the brochure hosted on cancer.ie advises keeping clear of boats and jet skis.

Shared spaces and neighbours

Most Irish sea swimming spots are public: slipways, harbours, piers and beaches shared with families, anglers, boat owners, dog walkers and local residents. Nothing official defines etiquette there, so these are courtesies worth keeping to, not rules:

Park where you will not block a slipway, a gate or a boat trailer.
Change discreetly. A changing robe lets you do that anywhere; see changing robes and post-swim kit.
Keep noise down at early hours and take your litter, including hot drink cups.
Ask before posting photos of other people online.
Be gracious about lifeguard instructions. If lifeguards raise the red flag, do not swim.
Check the notices. Councils post bathing water and jellyfish notices; the bathing water guide explains them.

Looking after a mixed-ability group

Pair new or nervous swimmers with an experienced buddy, and ask the buddy to stay in arm's reach for the first minutes.
Keep the first group swims short and in familiar spots. See sea swimming in Ireland for beginners.
Avoid peer pressure about temperatures or minutes. Winter swimming is not a competition, and Irish agencies give no safe minute targets.
Ask about medical conditions and medication in a way that makes it easy to say. See who should not do cold water immersion.
Agree what happens if someone goes quiet or cannot warm up, and who calls 112.

After the swim

Core temperature can keep falling after a swimmer leaves the water, so do not wave people off the moment they are out. Check that each swimmer is dressed, warm and talking normally, and that nobody drives away shivering. The brochure hosted on cancer.ie says the core keeps cooling for 20 to 30 minutes after you exit, and the Coast Guard and RNLI advise warm layers and a hot drink. For the detail, read after-drop and warming up safely.

Finally, end the swim by counting everyone out. If the group is larger than a handful, the shore watcher can tick names off, which sounds fussy until the one day it matters.