I've been excited about this card since I first saw it here a couple months ago. It is going to be huge versus two of the three major runner factions. Here are a few scenarios:

Anarch:

I see you are counting on your Datasucker to back up your Parasite. Sorry, my Archer has a quiver-full with your name on it.

Perhaps you think D4v1d will back up your weak @ss breakers? Nope, Susanoo is sending you to archives for the Shock! of your life.

Shaper:

Have you ever spent nine influence on the Grail suite just to then have the runner drop a SMC on the table? I have, and it sucks. So much for your big surprise. Navi prevents SMC from firing though. Artist Colony and Clone Chip won't work either.

I don't see this being as helpful versus Criminal, but there are literally a ton of cards that this will stop provided it is rezzed first.

EDIT: It is funny that despite my excitement over this card, I have yet to use it. As beladee mentioned though, there is now an extremely common criminal card that this can help thwart, Aaron Marron. I really need to try this out in my tag heavy deck.

While Navi has always been a solid card, it suffered from the "good but not good enough" syndrome. It did work against some shapers and a few anarchs, but was still dead in a ton of relevant match ups. I think currently though, it deserves a second look, because of one major reason: Pirates.

Both the popular Pirate Hayley archetype and the equally relevant Geist, involve cards like Kongamato, Grappling Hook and Gbahali as the major ways to break through the corp's ice. Guess what they are not? Right, ice breakers. This card says "bollocks" to all that nonsense and requires these types of decks to break ice the old fashioned way, buying you some time or even giving you an opportunity to have them face plant into something nasty with no way to break it. Cards like Self-modifying Code and Datasucker are still as relevant now as they were two years ago, meaning this card can still put in work in a lot of match ups, even those without the aforementioned non-icebreakers.

Is this card an auto include? No, definitely not. It is still 2 influence, meaning it is hard to find a slot for multiples or even one outside of NBN. And it remains a very meta dependent card. And especially with 419: Amoral Scammer on the horizon, and with it Turtle and GPI Net Tap shenanigans, Underway Grid might be a better 'tech' region, especially considering its zero cost and influence. But I think it is a definitely worth a slot in Yellow if you want to keep pirates from boarding your ship.