No it's not eye candy. It's raised when your still submerged to sweep for air contacts before committing to surface trim. Nothing worse than surfacing under a patrol where they have the drop on you, pun intended. As stated in the book passage, raise the SD and sweep for air contacts, come up to radar depth and sweep for SJ surface contacts, and then surface when clear. You may ask what's the point as air patrols can see you at P-depth? Most patrols only ran surfaced after dark and dusk and dawn were dangerous times to be surfaced. The above procedure would be used after dusk to maximize stealth and minimize risks.
Buddahaid
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