Why Does Navigation Show a Longer Distance Than Actual?
2 Answers
Automotive navigation GPS uses satellites to measure the speed and distance of the vehicle while driving. This measurement method inevitably introduces latency, which naturally results in the navigation displaying a longer distance than the actual one. Most errors range between 2-3 km/h. Navigation is only a reference; if you are particularly concerned about accuracy, you can use a professional GPS device for testing. Tips for using car navigation: 1. Do not charge the navigation device directly via a computer USB port: Most navigation devices require a relatively high current, typically above 1.5A, while USB ports generally provide only 0.5A. The insufficient current makes charging impossible. Therefore, if you want to charge at home without a dedicated home charger for your GPS navigation device, you will need to purchase a compatible current adapter. 2. Do not search for satellite signals indoors: You need to be outdoors with a clear view of the sky to receive satellite signals, as indoor locations cannot pick up signals.
I've been driving for over twenty years and find it normal for navigation distances to appear longer. This is mainly because route planning is based on actual roads rather than straight-line distances. Roads have curves and turns, and we often need to detour around hills, rivers, or urban congestion zones, all of which extend the journey. GPS positioning is more accurate in open areas, but in cities or near tall buildings, signal drift frequently causes inaccurate starting points. The algorithm intentionally selects longer routes to avoid accident risks or toll booths, reducing driving hazards. I've also noticed that when navigation updates are slow, the map data becomes outdated, and newly added small roads aren't included, requiring manual adjustments during actual driving. Additionally, real-time traffic considerations make the displayed distance include potential waiting time, which feels longer but is more efficient. Regularly downloading new maps and using reliable apps can alleviate this issue, but overall, I can accept driving a few extra kilometers for safety, especially noticeable during highway driving.
