Navigating an EFT compass in reverse poses challenges. Its magnetic needle points towards the magnetic north, opposite to the true north, which can lead to disorientation. This issue arises because EFT compasses are designed for use in the Northern Hemisphere, where the magnetic north is located below the true north.

To resolve this, you can use a declination adjustment mechanism on the compass or manually adjust the compass reading by adding the declination angle for your location. Alternatively, you can use a digital GPS device or a smartphone compass app that automatically compensates for magnetic declination. By addressing these issues, you can effectively navigate using an EFT compass in the Southern Hemisphere, ensuring accurate direction finding.