Abstract: A navigation device is disclosed wherein, in at least one embodiment. navigation instruction are adapted to the driver preferences. The driving behavior of the driver is recorded (like speed, time to prepare for an exit etc.), and the way he responds to navigation instructions (promptly, or always too late for example). Traffic, weather and time information may be combined with information on the driving behavior of the driver. This information is examined and used to build up a driver profile. This driver profile is used to adapt future navigation instructions. Alternatively, traffic and weather information may be used to build up route and/or environmental profiles. These profiles can also be used separate from the driver profile to adjust the navigation instruction. The combination of these two techniques, building up a profile (or adapt a pre-defined profile) and adapt the navigation instructions, makes the navigation device a more personal-fit navigation aid.

Abstract: A method of determining the position of a navigation device when only relatively poor GPS signals are available is described, together with a navigation device capable of determining its current location in such conditions. The method comprises the steps of receiving a plurality of GPS signals from a plurality of GPS satellites, determining range information from timing information forming part of said signals, together with identification information, specific to each of said satellites, attempting to receive and store the entire ephemeris data payloads additionally forming part of each said signals and being specific to each of said satellites.

Abstract: A navigation device is disclosed wherein, in at least one embodiment. navigation instruction are adapted to the driver preferences. The driving behaviour of the driver is recorded (like speed, time to prepare for an exit etc.), and the way he responds to navigation instructions (promptly, or always too late for example). Traffic, weather and time information may be combined with information on the driving behaviour of the driver. This information is examined and used to build up a driver profile. This driver profile is used to adapt future navigation instructions. Alternatively, traffic and weather information may be used to build up route and/or environmental profiles. These profiles can also be used separate from the driver profile to adjust the navigation instruction. The combination of these two techniques, building up a profile (or adapt a pre-defined profile) and adapt the navigation instructions, makes the navigation device a more personal-fit navigation aid.

Abstract: A navigation device is disclosed including a processor arranged to receive position information from a positioning device. The processor is also arranged to receive movement information from a movement detector and determine whether said device is standing still using said movement information. In at least one embodiment, if a standstill of the device is determined, the processor calculates an average position over time using information on consecutive positions received from the positioning system during a time period in which the device is standing still. The average position is used for navigation purposes, such as giving instructions to the user. By averaging during a standstill, a more accurate position can be determined which can be used to give better instructions.

Abstract: A portable navigation device comprises an accelerometer, a GPS receiver, and a calibration module. The calibration module generates calibration parameters that enable acceleration data from the accelerometer to be accurately converted into speed and heading data and integrated over time to give distance data. The calibration parameters are calculated from GPS derived speed and heading data and resolve or otherwise compensate for (i) the attitude of the portable device with respect to the horizontal plane (“pitch”) and (ii) the angle between the forward direction of the device and the driving direction of a vehicle the device is mounted in (“yaw”).