this can be a straightforward "plug-and-play" installation if the required wiring harness is already present in the vehicle. However, with some manufacturers, new wiring is required, making the installation more complex. The primary benefit of this approach is an integrated and factory-standard installation. Many original systems also contain a gyrocompass and/or an accelerometer and may accept input from the vehicle's speed sensors and reverse gear engagement signal output, thereby allowing them to navigate via dead reckoning when a GPS signal is temporarily unavailable. However, the costs can be considerably higher than other options. SMS Establishing points of interest in real-time and transmitting them via GSM cellular telephone networks using the Short Message Service (SMS) is referred to as Gps2sms. Some vehicles and vessels are equipped with hardware that is able to automatically send an SMS text message when a particular event happens, such as theft, anchor drift or breakdown. The receiving party (e.g., a tow truck) can store the waypoint in a computer system, draw a map indicating the location, or see it in an automotive navigation system. See also Augmented reality Automatic vehicle location Autonomous car Electronic Route Guidance System GPS eXchange Format GPS navigation device Global Positioning System (GPS) Guidance, navigation, and control Map database management Mapscape BV Mobile data terminal Navigation Data Standard (NDS) NavPix Navteq Personal navigation assistant (PNA) TomTom Traffic Message Channel (TMC) Hybride Navigation References Global Positioning System Automotive navigation systems Computer systems Dedicated application electronic devices Japanese inventions Applications of geographic information systems