Always use the Google Play Store for Android apps. Apps on Play Store are vetted for safety and security.
If you are looking for a legitimate logistics or travel app, I found mentions of: An app for boaters needing assistance. Shorelines : A lake management app. Datei herunterladen Air_&_Sea_3.3.apk
What is the of "Air & Sea" (e.g., game, logistics, travel)? Always use the Google Play Store for Android apps