What is an essential requirement when installing an aftermarket GPS system?

An essential requirement when installing an aftermarket GPS system is proper antenna placement. The placement of the GPS antenna significantly affects the system's ability to receive satellite signals and provide accurate location data. Ideally, the antenna should be located in a position where it has a clear line of sight to the sky, free from obstructions such as metal roofs, windows, or other elements that could interfere with signal reception.

Choosing an optimal location for the antenna ensures that the GPS system functions optimally by enhancing its signal strength and reliability. Proper installation techniques, including secure mounting and careful routing of cables, also contribute to the overall performance of the GPS system.

While other factors, like using factory wiring and compliance with local laws, are also important in the overall context of the vehicle’s electrical and legal standards, they do not directly impact the functionality of the GPS system in the way that proper antenna placement does. Therefore, focusing on the antenna's correct positioning is critical for ensuring that the aftermarket GPS system operates effectively.