User Manual 15 Y1-03-0203 Rev. J2.4 Explanation of the Soft KeysThe Soft Keys are divided into vertical static keys [M1-M4] and horizontal dynamic keys [M5-M8],which differ in function according to the current application.Soft Key Definition[M1]filter option on AIS targets in graphical view• FA (hides received Class A targets)• FB (hides received Class B targets)[M2] Display ModesThis Soft Key allows toggling between the different Display Modes.[M3]:Safety MessageThis Soft Key allows direct Message Writing. Either broadcast or addressed messagescan be sent in this mode. Pending alarms could be accessed by this Soft Key[M4]:Display Settings - Brightness and Contrast RegulatorThis Soft Key allows the Display Settings to be changed between Daytime,and Nighttime Modes.[Menu]: Go to Main Menu or return to the Navigation View Screen.[M5] – [M8]: These Soft Keys are described in individual screens2.5 Safety KeysThe NAUTICAST is fitted with Safety Keys, which allow the user to automatically send urgentmessages without the necessity of navigating the Menus.[MOB]The MOB Button sends out precise position of an MOB incident to AddressedVessels, therefore allowing the message to be sent to a vessel closest toaccident location.[SRM] The SRM Button sends out emergency Broadcast Safety Related Messages toall ships in the Vessel Listing.Note:For detailed description of the Safety Functions see Chapter 4.