I've had this marine surplus CRT thing lying around for some time. It says "Dataline", "CHART" and "Robertson" on the front.
On the back it has a 3 pin DIN labelled "power" and a 5-pin DIN labelled "VIDEO IN"
Anyone know what this is and how it could be used? I assume it's off a GPS. I'll post internal & external photos at some point. :macos: