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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
Udo?
A small island east of Jeju (the name means cow) with beaches and shallows used for snorkelling, including Hagosudong-type sand. A ferry, not a liveaboard.
Who are the haenyeo?
Jeju women who harvest on breath-hold, a living work culture listed by UNESCO in 2016. Tourists should not copy the work or treat a dive-ground as a playground. See freediving and Jeju's culture chapter.
Is Jeju tropical?
No. It is a warm-temperate to subtropical island. Visibility and soft-coral colour are seasonal, not a Maldives lagoon.
Seopseom?
Another Seogwipo islet on the same boat map as Munseom and Beomseom, often mentioned in the same brief.
Jungmun?
A resort coast with a beach and, nearby, the Daepo jusangjeolli (columnar joint) shore: geology as much as a snorkel. Swell closes it.
Summer snorkel visitors need a sealing mask and a rash top or shorty. Autumn and winter divers need real rubber or a drysuit. Boats supply tanks.
A haenyeo-style weight belt is not a souvenir and not a first-day toy.
Core kit
- Mask that seals — Wind and chop on Udo.
- Exposure protection that matches the month — The whole kit argument.
- Fins for a short boat hop — Small kicks near islets.
- SMB if the shop says so — Seogwipo traffic.
- Ferry timetable (Udo) — Listed as kit.
- Card and log — Islet boats check them.
Optional
- Drysuit (winter) — A local hire, not a tropical assumption.
- Hood and gloves — Autumn.
- Tabis — Columnar and lava entries.
- Whistle — Beach snorkel with wind.
Care
- Rinse volcanic grit — Skirts leak.
- Dry a hired drysuit as the shop asks — It is their lung.
- No pocketing shells from a working coast — Labour and law.
- Check straps in wind — They fail on the quay.
Budget bands
- Udo day — Ferry, mask, sleeves.
- Seogwipo weekend — Two boat dives, a suit that fits the month.
- Winter — Drysuit hire is the line item.
- Skip — A carbon long-blade as a haenyeo costume.
Spend on the suit that matches the month. The islet can wait for a green harbour.