HB units are partly compatybile - You can using data from it's to create map in RM, but HB dosn't read maps from RM, only tracks saved as .ht- in unit it looks like ishobats without depth data, You can adjust color, style of it. Best unit for RM is Lowrance HDS, Elite or...........every smartphone with android, GPS, and Locus app- for maps saved as MBtiles from RM.