An alien spaceliner zooms in on the approach to OAK. (how do you think the people from Berkeley get here, anyway?) It is going at 115,500 miles/second at a heading of exactly 300 degrees true.
Zrgfp, the navigator onboard the ship, records when the ship passes directly over the listed coordinates, which are a part of the AALS (Automated Alien Landing System) and notices that the ship passes directly over the cache exactly 7.1375 microseconds later.
Go find it!
You can validate your puzzle solution with certitude.