Always obey the height sign at the entrance. These are posted gantry limits. Pipes, beams and ramp crests inside can be lower, and roof racks, rails or antennas add height.
HDB data: HDB Carpark Information, data.gov.sg (Singapore Open Data Licence), 2,273 car parks. Mall and building heights are reports from the V23 group and their map positions are approximate.
Your location stays on your phone. It is only used to sort the nearest car parks.