Small Transport; Low Wing; 2 Turboprop Eng
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor
Flight Crew Last 90 Days 40; Flight Crew Total 19000; Flight Crew Type 2000
Communication Breakdown; Confusion
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action; Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Airspace Structure; Procedure; Human Factors
When receiving my clearance I first had the INDY6 and it was changed (during taxi) by ground control to ROCKY8 Departure. Immediately after departure I was cleared direct to TTH. Prior to arriving at TTH I received a clearance to ROCKY intersection; but I misunderstood and thought he said ROKNE intersection which was along my route of flight. I read back 'ROCKNE' and asked him to make sure that I was correct; and he confirmed my read-back. I think that one or both of us misunderstood what the other person was saying. About 20 minutes later Center asked if I was on course for ROCKY and I told him that I was on course for ROKNE. He said that was not correct; I told him I would correct the error; and he then told me to continue to ROKNE. Primary cause.... poor communication from beginning to the end.
A Pilot departed IND flying the ROCKY 8 Departure. When cleared direct to ROCKY Intersection; the Pilot verified ROKNE with the Controller since it was on his route of flight. Later ATC asked the pilot to verify direct ROCKY but the Pilot reported direct ROKNE; 386NM Southwest of ROCKY.