Cloaking

The game have cloaking tech, which allow you to build Cloak Ship, Holo Ship and Cloak Generator
 
The 2 ships works reducing or increasing its fleet size to the other players scanners, at 5% per ship, 50% maximum.
So if you have a fleet size 10,000 and 1 cloak ship, it will appear as 9,500, causing the enemies scanners to detect it later than it should at normal size (9500 seconds befor landing, not 10k)
And if you wish to scare them with a fleet size 7.5m, instead the real size 5m, add 5 Holo Ships
 
The Cloak Generator is a defense structure for your bases, it works similar to the Cloak Ship, by reducing its detection.  The scanners will only list your base at their screens if their Stellar Cartography Tech is at least equal level of your Cloaking Tech.