Autorouting in shallow water

Hello. I just installed an a98 MFD. Our yacht club is at the end of a long shallow bay and autorouting says it is too shallow to safely travel there. I have set the minimum water needed to one foot but it didn't help. I trust this is a Lighthouse issue and not a Navionics one as my iPad (running Navionics+) has no problem. Is there a way around this?

Thanks,
Gregg