En
15
The GP-1 does not supply the compass heading.
Local geographic and atmospheric conditions may prevent or
delay the acquisition of GPS data.
The GP-1 may be unable to receive GPS data indoors, underground, or in the
vicinity of large structures, trees, or other objects that block or refl ect satellite signals.
The positions of GPS sat-
ellites are continuously changing, preventing or delaying the acquisition of GPS data at certain hours of the day.
The presence of cellular telephones or other devices that transmit on frequencies close to those of GPS satellites
may also interfere with the acquisition of GPS data.
Note that the GP-1 may take several minutes to reacquire a signal if the unit has not been used for an extended
period or has been moved a great distance since GPS data were last received.
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