Add MOB / Man Overboard Function Add a MOB / Man Overboard function to the navigation map. When the user taps the MOB button, the app should immediately save the current GPS location as a MOB point and highlight it clearly on the map. The app should show: The MOB location on the map Distance from the current boat position to the MOB point Direction/bearing to the MOB point A clear visual marker for the MOB point Optional sound alert while MOB mode is active Option to cancel or clear the MOB point This feature is important for marine safety and helps users quickly mark and navigate back to a man-overboard location in an emergency.