I use CE as primary with Lowrance HDS 7/8 as backups. They run as sonars when underway and provide gps data to CE through an N2K gateway. To use CE as primary you should consider N2K and NMEA183 interfaces to be fully capable to receive and send AIS, AP, and position data. Radar I run on a separate display since I haven't made the 3G radar jump yet from an old Raymarine SLC70.
Tom
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