Narrative:

Handed off to departure control. Departure cleared us to 10;000 feet and 'on course to ctf.' the [previous 060] heading had taken us east of the 'on course' line from ZZZ to ctf so the first officer and I agreed that on course; is not direct and we needed to come left a few degrees to intercept the on course route. We both agreed that on course and not direct was the clearance. After a minute or so the departure controller asked if we were direct ctf. I stated no we were joining the on course route. He turned us to 90 degrees for a minute and then cleared us 'on course direct to ctf.' he asked if we misunderstood his previous clearance and when I tried to explain the difference between on course; and direct he did not agree and did not seem to understand that there is a difference. I do not know of any changes to those clearances and would certainly like to know if they have changed.

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Original NASA ASRS Text

Title: CRJ200 flight crew track deviation due to interpreting 'on course' to a VOR differently than Controller who believed it to mean the same thing as 'direct' to the VOR.

Narrative: Handed off to Departure Control. Departure cleared us to 10;000 feet and 'ON COURSE TO CTF.' The [previous 060] heading had taken us east of the 'on course' line from ZZZ to CTF so the First Officer and I agreed that ON COURSE; is not direct and we needed to come left a few degrees to intercept the on course route. We both agreed that on course and not direct was the clearance. After a minute or so the Departure Controller asked if we were direct CTF. I stated no we were joining the on course route. He turned us to 90 degrees for a minute and then cleared us 'ON COURSE DIRECT TO CTF.' He asked if we misunderstood his previous clearance and when I tried to explain the difference between ON COURSE; and DIRECT he did not agree and did not seem to understand that there is a difference. I do not know of any changes to those clearances and would certainly like to know if they have changed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.