Did you maybe mean sunlight?
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“The stupid and drunken mate, now acting as the captain, insists one day that his sunsight is correct, while everybody else's is wrong, and insists on the ship holding her course, which the other officers knew would lead her into danger.”
“Mahnmut knew from earlier sightings that there were kilometer-high cliffs to their north, and — somewhere — the broad opening to the flooded canyons of Candor Chasma — but the electrostatic charge in the dust storm was defeating his GPS receiver, and it had been two days since he’d had a decent star or sunsight.”
Looking for tweets for sunsight.