. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . N4VIGAT0B ABOARD SHIP AT "N" IS WITHIN RANGE OF STATIONS "M" AND "S" AND IS ABOUT TO RECEIVE LORAN SIGNALS STEP IZ PULSE FROM "MASTER" STATION ARRIVES AT POSITION OF NAVIGATOR "SLAVE" STATION HAS ALREADY RECEIVED "MASTER" PULSE AND IS WAITING FDR PROPER AMOUNT OF TIME TO ELAPSE BEFORE TRANSMITTING TO ASSURE CORRECT SYNCHRONIZATION WITH "MASTER"

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