Hello, I have a few questions to ask:
The GPS module being used is the FMB 640/641.
For obtaining accurate altitude data on a GPS device, is it better to use the GNSS speed source or FMS?
For obtaining accurate location data on a GPS device, is it better to use GNSS or FMS?
If the unit is set to use the CAN-based speed source but is not connected to the CAN bus, will the speed data be taken from the satellite speed? If so, how accurate is the displayed speed data?
For obtaining accurate altitude data on a GPS device, it is generally better to use the GNSS (Global Navigation Satellite System) speed source rather than the FMS (Fleet Management System). GNSS provides satellite-based positioning and altitude information, which is typically more accurate and reliable for determining altitude.
Similarly, for obtaining accurate location data on a GPS device, it is better to rely on GNSS rather than the FMS. GNSS systems, such as GPS, GLONASS, or Galileo, are specifically designed for global positioning and are widely used for accurate location tracking.
Regarding the speed data, if the GPS device is set to use the CAN-based speed source but is not connected to the CAN bus, the speed data will not be taken from the satellite speed. In such a scenario, the GPS device may not be able to provide accurate speed readings, as it relies on the data received from the CAN bus for speed information.
It’s important to note that the accuracy of displayed speed data depends on various factors, including the quality of the GPS device, the number of satellites in view, signal interference, and other environmental conditions. Generally, GPS devices are capable of providing reasonably accurate speed readings, but there can be some degree of variability and occasional inaccuracies, especially in challenging signal conditions or when using lower-quality GPS devices.