You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should take which action?
• Inland lock sound signals used on the Western Rivers and inland waterways • Difference between landward and riverward lock chambers at a dam • How locks communicate which chamber or what sequence a vessel should follow
• When a lock sounds two long blasts, is it usually telling you to "wait," to "proceed," or to specify a particular chamber? • Think about how a lock operator can clearly distinguish between landward vs. riverward chambers using simple sound signals—what pattern would make sense? • If you were the lock operator and wanted a vessel to hold position for traffic versus enter a specific chamber, how might you signal those different instructions so they are not confused?
• Verify what two long blasts (prolonged blasts) mean in the standard lock signal system for U.S. inland waterways (Western Rivers/Inland Navigation Rules references or USACE lock procedures). • Confirm how many long blasts are associated with landward chamber vs. riverward chamber, or whether long blasts are instead related to traffic direction or waiting. • Make sure you are not confusing meeting/crossing sound signals between vessels (Navigation Rules) with lock and dam operating signals (U.S. Army Corps of Engineers procedures).
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