Seems like the developers tossed it overboard. None of the apps works. Hey, guys, your products are still in use.

フライト時のナビゲーションを簡単操作で素早く正確にサポートしてくれます。 フライトログやフライトレコーダー機能があり、フライトコースのみならず、高度情報やヘディングまできろされ、保存されます。 その他多様な機能があり、もはやフライトの必需品となっています。

I've been using Air Navigation Pro for a very long time and have checked the competition many times and always come back. It is super easy to use yet full of features. I use it for flying around without a particular destination as well as for more complex navigation scenarios in which it definitely excels! Highly recommended! Also, their maps are always updated super quickly!