While it might not literally be 360-degree physical vision, it seems that they have (let's call it) "advanced spatial awareness"; a keen, heightened sense of their surroundings that allows them to recognize (literally) three-dimensional space in a way we cannot. This would aid in things like airship piloting and weapons accuracy. Trying to explain what sound is like to a being who can only sense vibration, not hear what the brain turns it into would be impossible. Trying to understand what the Garleans experience as perception of what the third eye is sensitive to might be very, very difficult.
It looks like this translation may have slipped through the cracks; I saw a separate comment saying that that hard mode would be "MSQ" mode.
