Canon EOS 6D Manual De Instrucciones página 192

Acquiring GPS Signals
Under favorable conditions, signal acquisition takes approx. 30-60
seconds after turning on the camera if radiowave conditions are good.
The antenna of the internal GPS is located at the front of the hot shoe.
GPS signals can be received even when an external flash is attached.
However, acquisition will slightly be weakened.
GPS signals can be received even when shooting with the camera
positioned vertically.
When traveling long distance, inaccurate information may be recorded.
Poor GPS Coverage
Location information may not be recorded, or inaccurate information may be
recorded where GPS signal coverage is poor, such as in the following
locations.
Indoors, underground, in tunnels or forests, near buildings or in valleys.
Near high-voltage power lines or mobile phones operating on the
1.5 GHz band.
When traveling through different environments.
Even in other locations, satellite movement may interfere with
geotagging and cause missing or inaccurate location information. The
information may also indicate that the camera has been used in a
different location, even if you are shooting at the same place.
G-8