Learn to use foward placement of the obs
The aliens really like to use the sensory chambers to cloak stuff... Heres a tip most people seem to be ignoring... place observatories on your offensive fronts. Got a little outpost? You better place an obs there. Secured a hive? You better place an obs in there too. Otherwise aliens and gorges can walts right in and ignore your mines/turrets. Even gestate and build in secret. A hive could go up with your turrets surrounding it without you even noticing. And those cloaked WoL's? They're totally exposed with an obs behind the wall.
Learn to place and defend those observatories, it'll greatly benefiet you marines out there. It's better than constantly sensor sweeping isnt it?
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