Acer d150 GPS navigator can be used in-car or on-foot as a handheld device. Acer is a relative newcomer in the car GPS unit market when compared to TomTom and Garmin. Acer D150 is designed around the concepts of usability and simplicity, featuring the CoPilot navigation software. A nice feature of this GPS is that it can warn you to slow down when you’re about to come to a hard turn.