If you have an asset that is targeted by a sub or sentry outside the range of your view - then the targeting sub or sentry and path will be displayed in your view but no fog radius will be lifted.
Sometimes if you have a Pirate and Navigator combo, you want to be careful what subs your target to "slingshot it" around the map because if you target a player's sub or outpost then they will see that you have the combo.
"If we don't know what we are doing, the enemy certainly can't anticipate our future actions." - Colonel Goodhead