When it comes to the remaining upgrades for the goggles, they are expensive and little do they change, by improving the enemy detection, negligibly, and helping you move around.
By default, the sonar goggles are unavailable and I recommend against wasting the 100 thousand dollars to unlock them because you will obtain these, for free,, after the third mission in the campaign mode. It's a good idea to unlock the elements of the suit, which make it easier to sneak, as soon as possibleĪs you start the game, Fisher only has standard goggles at his disposal that come equipped with night vision.