Mercury - 5-Pin NMEA 2000 / CAN H Extension Harness 1 m 84-879171T02. OverviewSometimes your GPS or IMU module just needs a little extra room to land in the right spot. The Mercury 84-879171T02 Extension Harness adds a simple 1-meter stretch to your NMEA 2000 or CAN H wiring so you can route things the way they were meant to be-without forcing cables to bend sharply or hang tight behind the dash. It's a clean, straightforward fix for those installations that are "just one meter short.". Key Feat