I recently just completed my Flight Review after not flying for 6 years. I'm so happy to be back in the skies and loving all of the new technology out there. Especially Foreflight. My set up right now consists of: Iphone Xs on a RAM suction cup mount on the left side of the dash (C172). I want to be able to have accurate GPS for when I start getting more into Cross Country flights. Basically, I don't want to rely on my iPhone GPS. I want to go into airplane mode and still have GPS. I may upgrade to an iPad soon but just want to get a feel for what I want in the cockpit. I see the sentry mini has WAAS and the Bad Elf says WAAS compatible. What is your take on Sentry Mini versus the Bad Elf versions?