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The Simrad BR24 is the radar transceiver listed as compatible with this M121 display device.
It is listed as compatible in the 2KW, 4KW, and 6KW types.
However, both the M121 and the BR24 are listed as discontinued. In other words, the BR24 may or may not be hard to find, but both are somewhat obsolescent (if not obsolete) equipment.