Canon GP-E2 Instruction Manual page 62

Using the Digital Compass
Viewing the Compass When Shooting
You can see which direction the camera is facing as you shoot.
With the EOS 7D, you cannot use the receiver's digital compass.
With certain cameras other than the EOS 7D, you also cannot use the
receiver's digital compass. For details, refer to the camera's instruction
manual or Canon Web site.
Images will not be tagged with the correct shooting direction unless the
camera and receiver are facing exactly the same direction.
The direction is not logged.
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To view the compass, press the
<B> button or <B> button.
Cameras equipped with an electronic
level will display the compass with the
level.
The compass is also displayed in Live
View or movie shooting.