Simrad recording data same way as Lowrance. So, choose .sl2 or SL3 and just recording it. Reefmaster open this as viewer and can export At5 maps- as usually for Navico units. Data are depend on xdrc plug into MFD. When using ss3d only -there's no 2d data, when you use HDI transducer- no structurescan data in file. Sl3 is just file container which combine all sonar data( 2d, DI, SI) to one file. Default setting is .sl3 which recording more data( from 3D mode in ss3d),but those data are useless fo real.