Garmin 60C-> help with Marine Navchart ?

The Australian dealer successfully uploaded part of bluechart Pacific V 6.5
plus city navigation Australia V5 in my 60C -Software version 3.50.

I think the quality of the GPSMAP60C is great but there is a serious lack
of documented manual from Garmin.

In a rough estimate, my GPSMAP60C has about 25% more "undocumented screen"
than Color_Map_Navigator_Owner's_Manual describes.

I have NOT been to get an explanation about these screens.

Plus the Color_Map_Navigator_Owner's_Manual explains about road navigation
but mentions hardly anything about Marine Navigation.

1) Would anyone know where I can find more marine explanations for the
MAP60C?
Like a "Reference Manual" or webpages for the MAP60C?

2) Because my MAP60C is loaded with the Basemap(original) plus 2 types of
charts ( bluechart Pacific V 6.5 plus city navigation Australia V5 ) I have
problem to "hide" and "unhide" the bluechart and city navigation.
Menu SetupMenu
then it displays
"Menu"
--restore defaults
-- restore ALL map defaults
--Show All
--Show None
-- Show Basemap
-- hide Bluechart Pacific
--show citynavigator
( this is only one example - there are more undocumented screens like this)

The last three are NOT toggle switches. This wording (SHOW or HIDE) make it
very difficult to understand what type of map is ON or OFF.
"SHOW" and "HIDE" are not friendly toggles.

When I toggle the Bluechart Pacific by having it set to HIDE the PAGES do
NOT seem to change if BASEMAP is on HIDE.

They remain City Navigation PAGES instead of MARINE navigation PAGES.

Is there a way my PAGES can default automatically to MARINE or
CITYnavigation?

Guy