If memory serves me right, it's Birdsville Race weekend?
If so beware bleary eyed aircraft from various other States going to and fro and sometimes even radio silent to avoid landing fees, not to mention some having no concept of the circuit directions at LEC.
Above 5000' will be smoother, and use of the GPS in a steady climb will give you a best GS altitude. If you use the GPS keep track of known positions/times manually on the map. Fly the one mile right of track offset VFR.
If you are going near the Marree Man (OOD-LEC) worth a minor diversion, likewise Wilpena Pound on the way home (beware j/f in that area).