In addition to the mechanical options and software options, it is possible to select hardware options.
These require an additional PCB and front plate. See appendix 3.
Dual system (DL21)
The DL2 (JB70D2 electronic unit) can also be upgraded with an extension card where the card can
be used as a separate single axis Doppler speed log. In addition to the PCB, an additional sensor or
the sensor of type DL21S is required. This sensor contains both 2 axis (270 kHz) transducers, but
also a single axis (715 kHz) speed log within the same housing. New regulations for vessels over
50 K GRT (Gross Register Tonnage) state that the vessel must have separate (electrically isolated)
systems for speed over ground and speed through water. This system and the use of auxiliary +24
V DC power on the JB70D2-X electronic unit meets this criteria. A CD402CU-XX control unit will also
be required for the secondary system.
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