Cluster missions that require you to scan a bunch of stuff are my least favorite, but they don't have to be.
Currently, I get frustrated because the objects to scan do not show up on the map, and from a distance, I can't recognize objects I have already scanned (the 'interactive glow' isn't visible until I get closer).
But I like these missions because they are one of the few examples of peaceful exploration in the game.
So how about this: Implement a beeping tricorder, like the one in Wrath of Khan, that beeps more quickly the closer you get to what you are looking for, hotter/colder style, and only detects unscanned objects. This turns the away mission into a mini-game, makes it more fun, less frustrating, and more Star Trek like.
Or, make it possible to re-calibrate the tricorder so that the anomaly detector locks on mission items instead.