How do I know how much current an NMEA 2000 product will draw from the network?

Manufacturers of NMEA 2000 equipment are required to disclose the amount of current drawn from the NMEA 2000 network. The amount of current used from the network is expressed as a Load Equivalence Number (LEN) where each LEN is equal to 50mA. For example, a device that draws 0.5 amperes (500 mA) from the network would have LEN equal to 10.