Thus in the BUZAD shown you would be required to pass over the D10 before turning onto the BIG 331 whereas the kit might 'anticipate' that turn.
If if helps (which it probably doesn't), here are the AIP and FMS versions of the BUZAD3K SID:
AIP:
Climb straight ahead to LON D1.5, then turn left onto track 052° to intercept LON VOR R073, cross LON D10 at or above RWY 09L 3000 and turn left onto BIG VOR R331, cross BIG D20 at or above 5000 and BIG D23 at 6000 to BUZAD.
FMS:
SID BUZA3K RNW 09L FIX OVERFLY D113B AT OR ABOVE 590 TRK 052 INTERCEPT RADIAL 073 TO FIX D073J FIX OVERFLY D073J AT OR ABOVE 3000 TURN LEFT DIRECT FIX D331T AT OR ABOVE 5000 FIX D331W 6000 FIX BUZAD
I would interpret "OVERFLY D073J" (D073J corresponds to LON R073 D10) to mean that the turn won't start until after that point, but I could well be wrong.