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The tracker will send a position report every X number of seconds. These position reports are represented by icons on the map (arrows and dots). The red line that join these icons only show you the order of these icons and does not represent the path take by the tracker.
If you want a more detailed track of the path taken by the tracker then you can change the report frequency with the "send command" button and make the tracker report more frequently its position but at the expense of using more energy thus making the battery charge last a little less time.
GPS signal will always have a margin of error. With the best view to the sky a GPS enabled device will have an error of about 30 feet. This margin of error may be greater when the tracker is hidden in a vehicle.
It is normal to notice these drifting position reports with larger margins of error more while the tracker is parked for long periods of time, like when the tracker is parked overnight. The position report will become more precise when the tracker starts moving again.
The tracker will have a difficult time acquiring GPS signal indoors and in areas with tall buildings around.