ACR WDB DEVIATED FROM CLRNC ROUTE ON EXTENDED OVERWATER OPERATION. AMENDED CLRNC ROUTE WAS FOLLOWED AS RECEIVED; BUT APPARENTLY MESSAGE WAS GARBLED BETWEEN CTLR AND COMMERCIAL RADIO.

Narrative

SUBJECT: ATC COM ERROR WITH COMMERCIAL RADIO CAUSING AN OCEANIC NAVIGATION ERROR. FLT CLRED PER ORIGINAL ICAO ROUTING ON BOTTOM OF FLT PLAN. AT MID OCEAN CLRNC WAS CHANGED TO '47N/140W DIRECT 48N/130W DIRECT DOLFF INTXN DIRECT TATOOSH DIRECT SEA.' JUST AFTER 150 W CLRNC WAS FURTHER CHANGED TO 'PRESENT POS DIRECT DOLFF INTXN DIRECT TOFINO DIRECT TATOOSH DIRECT SEA.' FIX MAP SHOWS THE INITIAL ROUTE; SECOND ROUTE AND THIRD ROUTE. I DEDUCE THAT THE THIRD CLRNC WAS MEANT TO BE ONLY 'DOLFF INTXN DIRECT TOFINO DIRECT TATOOSH DIRECT SEA.' ALL CLRNCS WERE ACCEPTED AND READ BACK PER COMPANY PROCS; AS WAS REPROGRAMMING AND CHKING OF THE INSTRUMENTS. ACFT FLEW AS CLRED. ARINC (ATC) QUESTIONED OUR 140W POS (48 DEGS N/140W); WHICH WAS WHERE THE DIRECT ROUTING TOOK US. THIS WAS APPARENTLY WHERE THEIR MISUNDERSTANDING CAME TO LIGHT. ACFT PROCEEDED AS CLRED. PARENTHETICALLY VANCOUVER CENTER NOTED WE WERE 10 MI N OF DOLFF INTXN TERMINAL OFFSET READOUTS ON INSTRUMENTS WERE 20; 3; 3. APPARENTLY #1 PULLED 2 AND 3 N IN 'TRIPLE MIX.' AFTER ARR I CALLED FAA OAK OAC AND SPOKE WITH SUPVR. HE STATED THAT COMPANY ACFT WAS OUT OF THE PICTURE; THE PROB WAS A COM BREAKDOWN BTWN ATC AND COMMERCIAL RADIO. FIX? FIND AND FIX THE SPOT WHERE COM BROKE DOWN BTWN THE CENTER AND COMMERCIAL RADIO.