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congested area because of reception hindrance
5. In some vehicles with special glass coating or sun-proof coating on the windows,
GPS receiver may not function in a normal condition due to unstable reception. And
also the electromagnetic wave emanating from the various vehicle instruments may
cause such problems.
6. In vicinity of tall buildings or high voltage power cables, the signal may become
weaker or interrupted.
7. If the vehicle moves while GPS reception is not good, it may take more time to
search the current location than standstill state.
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Installation Instruction