Looking back at the official answers thread, Sam has previously ruled that Sniper Shot should not generally apply to planetary weaponry (but he doesn't see a real game balance issue if it is allowed). He also says that the Advanced Targeting Array specifically should allow for Sniper Shot if that Mod is taken. Regardless, it should be possible to use Sniper Shot from a vehicle in some manner.
In space, this creates a curious situation. It appears to be possible to use Sniper Shot to fire a weapon beyond the Sensor Range of the firing ship. Assuming that your not getting sensor feeds from another unit (there's another thread for that), can you fire your weapons beyond your Sensor Range?
Example: A Y-wing has Sensor Range Close. It also has Proton Torpedoes that can fire to Short. In order to do so, would it first have to have a crew member use an Action to actively extend the Sensor Range (per the rules for that)? If the Y-wing is fitted with an ATA modded for Sniper Shot, the Proton Torpedoes can now fire to Medium, but can it actually engage targets at that range when its Sensor Range cannot exceed Short?