If you don't know how to activate the FSS mode... first you should be on Hyperspace and 30kms speed... 2nd you have to press the triangle button and R1 together on you PS4 to start the FSS mode....
On the newest update of game using FSS scanner to scan fully... even mission content...
ELITE DANGEROUS
store.playstation.com/#!/en-gb/tid=CUSA05308_00
T.S.K. B