You'll also have 2 or 3 different GPS feeds into your main ECDIS anyway, so if 1 dies you can switch to the other.
But yer, if you have to do manual fixing onto an ECDIS without a position, it becomes a pain in the ass - not impossible to do... I'm pretty sure all ECDIS's have to have the facility to manually fix a position.
This might spark an interesting debate on the use of ECDIS as a primary means of navigation. But if it was and it wasn't seen (clutter/layers turned off/distraction) then I'm sure many will be calling for some changes.
So if you lose your GPS there's effectively no way to plot a fix if you don't have paper charts available?
I will, of course, bow to experience, but that's my 2p.
Hitting "Standard Display" should cause all navigational hazards to be shown on the display [there was a bug with some ECDIS systems that weren't displaying correctly but these should now all have been fixed - all the manufacturers issued their mandatory updates early in 2011] I prefer the paper charts - my opinion is that we should at least carry the small scale overview charts of areas - but although I prefer using the paper charts - ECDIS is far easier and to be honest lazier to update, with ECDIS charts you click update and it goes and downloads them - or you plug in a USB stick... To do the weekly updates on a full world folio of BA charts takes between 4 and 8 hours per week but my rants about chart corrections is a different matter!
You're right, I suppose there's so many advantages.
Silly question though, and one that I should really have asked at sea, but is it possible to plot "manual" fixes on ECDIS?