🧑‍🦯➡️🧱

#person with white cane #walking into wall #blind collision #unforeseen obstacle #literal blindness obstacle #navigation hazard

🌊🌿🌿🚧

#sudd #obstruction #vast swamp #navigation hazard #sadd #papyrus barrier

🚢⛔️🌊

#shoal warning #navigation hazard #shallow hazard #sandbar danger #maritime obstacle #grounding risk