EXONIC EXD 7088GPS2 - Manual (Page 46)

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7 Appendix
7.1 Attention
It is not a system failure under circumstances listed below:
Situations that can affect the GPS positioning:
„
Sometimes, when you are driving on the highway, the floating point swings.
„ When you are driving on a very steep road.
„ When you are driving on a spiral road, you will find that the floating point swings. It is nothing to do with
the radius of the road and the driving speed of your vehicle. One reason might be that the real road
condition may differ from the information of the electronic map.
„ When you make a right/left turn to enter a road and that has parallel roads nearby (less than 55 yards
distance), you might find that the floating point may go to another road.
„ When driving on a wide road in a curving line, you may experience that the floating point may swing due
to the mismatch of real distance.
„ Before returning to a ground road after you have been driving in an underground car park or a spiral path
of the multi‐level car park, you will find that the floating point may swing. When your car is in a rotary
elevator, the arrow of the floating point may not point to the right direction.
„ Providing voice prompt at a branching path ahead.
„ The guided distance may deviate from the actual distance rate.
When any of those situations occurs, the GPS satellite will automatically adjust the current position fix if
you keep driving.
Problems caused by map files:
„
When you return from a road which is newly constructed to a road recorded in map file, you may find
floating point swings because the map file may not reflect the real road conditions. After you keep driving
for a while, the system will adjust it to the right position using GPS signal information
„ No through way due to road closure or pedestrian path
„ Opening of a new road and closure of an old road;
„ Guide to a no‐through way;
„ Route re‐computed again without changing the proposed route;
„ If there are only small lanes without a normal road near the destination, the system will only guide you to a
place near to your destination;
„ Instruct you to make a U‐turn;
„ No indication at a branching road;
„ Turning instruction mismatch the real road condition;
„ No indication of direction or voice prompt about entrance/exit while guiding on highway/extap way;
„ Schematic map may mismatch real road conditions.
Places having difficulties to receive GSP signals
„ In tunnels;
„ Between high buildings;
„ Under bridges;
„ In trees/forests;
When using external GPS antenna, we recommend that you place it on the roof of the car. If there is
rack on the roof of your car, please make sure to separate the rack and the antenna.
GPS is managed by the Department of Defense of USA.