Any Unknown or Unlisted Aircraft Manufacturer
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 30; Flight Crew Total 7500; Flight Crew Type 700
Distraction; Situational Awareness
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Procedure; Aircraft; Human Factors
We were being vectored during the climb with a couple of different assigned headings. We were advised by ATC that we would be cleared to our destination in approximately 5 minutes. We were then cleared to our destination. I entered a direct in the GPS and selected NAV Mode. We turned towards our destination; but were not going direct to it. The Controller asked us if we were going direct to our destination right after we discovered we were not. We were already in a turn to the left heading direct to the destination. There were no conflicts or other aircraft that showed up on our TCAS. The problem arose as my normal co-pilot was out sick in quarantine for potential Coronavirus and I had an inexperienced co-pilot. In addition to flying the aircraft; I was monitoring the new co-pilot as he was unsure of himself in this aircraft. We completed a 20 degree turn; so we were flying direct to our destination. The co-pilot's inexperience contributed to this event. Also contributing to the event was a 125 knot crosswind that made the track less intuitive.
Pilot reported experiencing a track/heading deviation. Pilot stated the deviation occurred in part due to flying with an inexperienced co-pilot.