Next time you are sailing in the Golden Gate and you spot a humpback whale jumping up against the horizon, fear not: there’s now an app for that. 

Bay Area scientists on a weeklong research expedition that began yesterday tested the “Whale Spotter” mobile application, which they hope can crowdsource location data to prevent fatal collisions between migratory whales and commercial ships traveling in and out of San Francisco Bay. 

“We need a way to…