[CA] Red path on Axiom Pro RVX

New Configuration: Dual Axiom Pro RVX 12, EV 150 autopilot, 24 inch HD radar, RV100, B175HW, M265LM, RS-150, 70 VHF, Navionics Platinum+. Went out on sea trials this weekend. New electronics worked very nice. I did notice a wide red path on the chart screen about 50 foot wide from the home-port marina out to the inlet. Look at the Lighthouse manual from the March 2018 update and didn't see anything noted. What is this?

Thanks