If you can see parts of the day when a vehicle has not reported, and you know the vehicle has moved during this time, this may be due to it being out of coverage.
Check back in view history on this vehicle and look at the GPS signal around this time. If you can see is EXCELLENT, then suddenly OFF, this may be due to one of these 3 reasons:
1. The vehicle could have gone out of coverage. If the coverage around this area is extremely good, it may have gone into an underground carpark or be in an extremely built up area which can affect the GPS signal.
2. The GPS aerial connection may be loose. If you can see the GPS connection intermittently going excellent>off>excellent>off while it is moving, then this would be due to the aerial connection disconnecting then reconnecting again while the vehicle is going over bumps in the road. Please contact Argus Support if you see this happening to arrange a technician to check the aerial for you.
3. The aerial is being tampered with. We literally have seen it all! The most common situation is when the aerial has been disconnected in the morning and then reconnected again later at the end of the day. Check the times this is happening. Does it coincide with the working day? Does the GPS signal disconnect after the vehicle has stopped? (if this was a loose connection this would usually happen only when it was moving).