Leave Krugersdorp on the Sterkfontein Road, R563, and proceed west past the Sterkfontein Hospital and Oaktree garage towards Hekpoort. When the road forks after 1 km, go right towards Hekpoort on the R563. Pass the Sterkfontein and Greensleeves turnoffs. The entrance is not signposted, but there are five satellite dishes close to the road.
Satellite dishes are visible some distance from the road on the left.
Once inside the gates of CSIR-SAC and HartRAO, drive 3 km down into the valley. After 1 km you will pass the CSIR's Satellite Application Centre on the right. HartRAO is at the end of a steep descent into a valley. Note that all visits must be booked in advance. Click on the map below for a full size version.