船の事故回避船舶の接近をお知らせ - ジェイマリンJM-, formerly known as JM-WatcherⅡ, is a free accident avoidance app that supports safe navigation of small and medium-sized boats. This app helps to notify the approaching ships for the boats. It can also be useful for marine sports, such as water skiing and kayaking, to avoid danger. It can help detect danger quickly while fishing or operating a fishing boat.

The app notifies the user about the approaching ship's location and warns them of potential collisions or accidents through audio or notifications. It also supports safe navigation in low visibility conditions such as fog or night by providing real-time information about the surrounding boats' location, including AIS boats and smartphones with the app installed. The app also provides real-time wind direction and speed information, making it easier to navigate. The app is available for Android 7.0 and above and requires at least 2GB of RAM.