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Safety & etiquette · Beginner

SUP waterway hazards — weirs, river mouths and boat traffic

Spot three hazards on the field guide map and plan where to launch, return and get off the water before you paddle.

An aerial-style waterway diagram marking 1 a weir on the left, 2 a river mouth and 3 a vessel channel on the right.
The training map shows three hazards in one scene. ① Weir, ② river mouth and ③ vessel channel. Starboard Korea SUP Field Guide.

Plan your way out and back from shore. If the route goes through a weir, a river mouth or a vessel channel, choose a sheltered, permitted practice area for your first sessions.

01. Weirs — watch for recirculating water

A weir can hide its drop from paddlers approaching upstream. Water falling over it can loop back towards the structure downstream, trapping people and boards in a recirculating current.

Check signs and guidance from the local waterway manager before you launch. Where a land bypass is allowed, confirm a safe exit upstream, a permitted carry route and a place to relaunch clear of the hazard. Choose a different route if you cannot confirm all three.

02. River mouths — conditions change with the tide

Where a river meets the sea, the speed and direction of the flow can change on the incoming and outgoing tides. Strong currents can concentrate where the waterway narrows.

Calm water at launch can change by the time you return. Check the tides and local restrictions for both times. For early sessions, choose a route that avoids crossing the river mouth.

03. Vessel channels — keep the route clear

Larger vessels have limited room to turn in narrow channels. Glare and chop can make a low SUP hard to spot, and the wake from a passing boat can spread into nearby water.

Plan a route clear of harbour entrances and vessel channels. Keep looking ahead, to either side and behind. Give approaching vessels plenty of room to continue.

04. Pick your exit before you launch

Identify where to launch, where to return and where you can get off the water along the way. Check local notices, tides and wind, then share your route with the people paddling with you. At an unfamiliar spot, ask a lifeguard or instructor where practice is allowed.

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