National Instruments NI 9411 Operating Instructions And Specifications page 6

Special Conditions for Marine Applications
Some modules are Lloyd's Register (LR) Type Approved for
marine applications. To verify Lloyd's Register certification, visit
ni.com/certification
look for the Lloyd's Register mark on the module.
Caution
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
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and search for the LR certificate, or
To meet radio frequency emission requirements
5 NI 9411 Operating Instructions and Specifications