EMB ERJ 170/175 ER/LR
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 7
Confusion; Situational Awareness
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Provided Assistance
Human Factors
Aircraft X departed MFR on the Jackson1 off RWY32. [I] told aircraft 'leaving 042; turn right heading 120; when able direct ACLOB (fix on flight plan).' Aircraft repeated 'Out of 042; turn right...say again heading...when able direct ACLOB.' I repeated 'Leaving 042; turn right heading 120; when able direct ACLOB; resume own navigation.' Pilot read back instructions correctly. I observed a slight turn of the aircraft out of 032 (MVA in area is 033); but I thought they might just be correcting heading to OED; which is part of the Jackson1. Nope; they continued to turn ENE; but not in a sharp turn to 120 [heading]. I almost thought they were maybe issued the Eagle departure instead; and just had started turn late. They were above MVA at this time; and no conflicting traffic. I just allowed them to continue turn to 120 [heading] and ACLOB.Not sure if Aircraft X may have an FMS issue with this departure procedure. I am not the only controller who has noticed them start a turn to the ENE on the Jackson1; without instructions to do so.
EUG TRACON Controller reported an aircraft turned early on the JACKSON ONE departure.