Challenger 350
Flight Crew Air Transport Pilot (ATP)
Confusion
No Specific Anomaly Occurred All Types
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Chart Or Publication; Aircraft; Airspace Structure
We received our clearance PDC; and it included flying the WLKKR3 RNAV departure from Runway 16R at VNY (Climb via SID except maintain 4;000 feet). The Captain and I reviewed the departure chart and it shows on the plan view that we are to cross the VNY D1.5 'At or below 1;750 feet;' and then to 'Climb to 1;303 feet.'This is; at best; confusing. The narrative is slightly better; except that the narrative doesn't include the detail about 'at or below 1;750 feet.' NOTE ALSO THAT THE 'AT OR BELOW 1;750 feet' RESTRICTION WAS NOT IN THE FMS. And neither the plan nor the narrative makes it clear when you are to climb above 1;303 feet.We contacted Clearance Delivery by radio to ask what it was that we were expected to do. We were told that the 'at or below 1;750 feet' was a limitation; but the 1;303 feet was there to prevent airplanes from running into terrain. So we were to comply with the 'at or below 1;750' at 1.5 DME; and then climb to 4;000 feet'.Change the chart to clarify that the 'Climb to 1;303 feet' only pertains to the minimum altitude before making the turn to PPRRY (which isn't much of a turn at all); rather than appearing to be a limitation on how high you can fly. Also; the presence of the shaded circle adds to the confusion; because its purpose isn't apparent. If the shaded circle were not there; it might have been more apparent that the 1.5 DME from VNY VOR was essentially at the departure end of Runway 16R.
CL-350 pilot reports confusion regarding the initial climb segment on the RNAV SID chart and climb restriction was not in aircraft database.