00Monsoon Fishing Trips — The danger comes from "time," not "water"
In the marine accident statistics released annually by the Korea Coast Guard, the number of incidents in July–August shows a distinct peak compared with other periods. Most causes are classified as “sudden weather deterioration,” but when looking at actual cases a more accurate description is "Departures that missed the pre‑deterioration signal" That is the case. Monsoon safety is a matter of decision‑making, not equipment.
01Before departure — Triple‑check weather information
The Korea Meteorological Administration issues advisories for the sea at the following levels.
Marine Advisory Issuance Criteria
On days when the monsoon front is active, even if no advisory is issued localized gusts exceeding the thresholds These occur frequently. Therefore, pre‑departure checks must cross‑reference the following three items.
Proceed only when all three pieces of information point toward safety. If any one deviates, stay ashore that day.
02Heavy Rain — The greatest hazard is visibility
The primary risk of monsoon heavy rain is not flooding but loss of visibility That is the case. Rainfall exceeding 30 mm per hour reduces visibility to within 100 m, dramatically increasing the risk of collision with other fishing or commercial vessels. Coastal observation data from the Korea Institute of Ocean Science and Technology also show that summer visibility under 1 km coincides precisely with heavy‑rain periods.
When heavy rain is detected, immediately carry out the following.
- Turn on all navigation lights(even during daylight)
- Maintain listening on VHF channel 16
- Reduce speed immediately, and if possible keep distance from other vessels
- Re‑verify AIS transmission operation
03Squall‑Like Winds — Sudden gusts from calm conditions
The phenomenon called "non-equivalent gale" is frequently observed near the monsoon front. Even when wind speed forecasts are ≤5 m/s, wind speed can spike to ≥15 m/s within the short period that a cumulonimbus cloud passes. In the Korea Meteorological Administration marine forecast, "Localized gusts possible" Days with this wording indicate this pattern.
Response principle is simple.
- If a cumulonimbus (dark towering cloud) is seen, determine the evacuation point within 5 minutes.
- Proceed to the inner side of the harbor/breakwater or the nearest anchorage.
- Sails·awnings·umbrella‑type gear should be folded or secured immediately.
04Emergency return procedure — before and after pressing 122
Korea Coast Guard report number 122 is the standard maritime emergency channel. In an emergency, follow the steps below.
- Confirm all life jackets are worn(crew and companions included)
- Secure current position coordinates(ship GPS or mobile phone GPS coordinates)
- Report on 122— location, number of persons, condition, vessel identification number
- Simultaneous transmission on VHF channel 16
- Activate visual and audible signals such as navigation lights, flares, and foghorns
- After reporting, the principle is not to force a self‑navigation return. This is the case. In Korea Coast Guard case analyses, many incidents that escalated involved attempts to self‑navigate back after reporting, leading to secondary accidents.
05Fishing vessel act — also a passenger right
The Ministry of Oceans and Fisheries’ fishing vessel act regulates passenger numbers, life‑saving equipment, and weather‑based departure restrictions. From a passenger’s perspective, the following are rights to verify before departure.
- Whether a passenger manifest is prepared
- Whether life jackets are provided for the number of persons
- Compliance with departure restrictions during gale warnings
"Allowed to go" is not the standard; the standard is "confirmed it is permissible to go".
06One‑line principle
During the rainy season, it is normal to have more days of no catch than days of catch.
The more veteran, the more often they postpone departure. Safety is not a virtue of a conservative person but a skill of a seasoned angler.