Vehicle tracking is pretty dam accurate. In fact its accuracy is within 3 metres. This basically means that it can tell you where each of your vehicles, but can be out by up to 3 metres. This means that if one of your fleet is driving along a thin country lane then it is possible it may be plotted on the map as driving along just off the side of the road.
This does not mean that the vehicle is driving off road or that the vehicle is driving through the row of trees next to the road. This just means that the GPS is slightly inaccurate and therefore is plotting the vehicle slightly off the road. This does not always happen, but does happen from time to time.
The customer service staff for vehicle tracking companies have often reported that customers do phone up from time to time to ask why the tracking system is plotting that their vehicles are off road slightly.
GPS tracking is pretty dam accurate considering and is certainly accurate enough for the purposes of knowing where your fleet is. You do have to use some common sense to realise that one of your vans is not driving next to the road, but in actual fact driving on the road.
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