Geocachers today! Using smart phones instead of hand-held GPS units, back in my day I used a driving GPS, switched to coordinates mode to find my caches! (Seriously.) I use to spend hours designing the perfect caching route, making detailed spreadsheets of pertinent details before mapping the best route to hit them all during the run. Now I can open an app on my phone and BOOM, I have all that and more, and frankly that's amazing and I don't miss the old days at all. The ability to impromptu cache and the lower than ever bar to entry to the game are only good things.
All that said there's still a mentality of Anything You Can Do (I Can Do Better) amongst some cachers when it comes to using an old school GPSr or a smart phone. This cache will absolutely require you to have a smart phone to find it as the information needed to open things and sign the log is stored in the 2.4GHz wireless spectrum.
There are three locations in this mystery, one is the main cache (or the lock) and the other two are the keys. You will need to visit the keys to find out the information needed to unlock the main cache. To that end you'll need your smart phone (or anything that can see wireless networks) and a USB battery pack. The keys are fairly close to the lock, and you won't need to move them from their particular GZs to open the main box.
Once the keys have imparted their wisdom opening the main cache, signing the log and scoring some SWAG should all be a GPS navigated walk in the park!
Warning: The Blue Key has proven itself extremely elusive, if you find yourself stuck you can click here for a video hint. It comes in four sections each one more spoiler ridden than the last.