Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Confusion; Situational Awareness; Distraction
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Chart Or Publication; Human Factors
ATC changed our clearance via CPDLC (Controller Pilot Datalink Communications) before push to the Offshore2 [SID] McKey ZZZ as filed. Loaded SID in FMC Runway 1L. Observed a [disconnect] after SEPDY. We questioned Clearance Delivery what they wanted us to fly after SEPDY. I assumed a 203 degrees heading to intercept the PYE [VOR] 151. Noticed there were several points not programmed in the FMC..This clearance is confusing and the SID is very poorly written. What is expected after SEPDY?  Will ATC give us vectors or are we to intercept the radial on our own?We questioned both Clearance Delivery and on initial contact with Departure so there was no deviation; but this needs to be better written on the SID procedures. Rewrite this SID to better explain what ATC expects the pilot to fly ie. radar vectors after SEPDY.
Captain reported SFO OFFSHORE2 SID required clarification.