We are frustrated with Furuno's lack of response on this issue to date.
The image on the left is a screen shot of a genuine Navionics chart running in a Raymarine Chartplotter

There is no tide data and no useful depth information. Further zoom reveals nothing further.
(The red squares are way points we have put on)
Furuno Update
After protracted communication with Furuno
Support we have finally been advised that they will provide the unlock
code free of charge for the CMap Chart Chart which covers the Navionics
chart area we purchased.
MaxSea France does confirm there may currently be shortcomings of the Navionics based MM3-V69-P00
( S. China Sea ) map data.
This
will hopefully resolve the problems. We will keep you posted here when
we return to Taipan in late December and update the charts.