On a ship that uses on ECDIS and paper charts as a backup is it more prudent to maintain a DR and plot fixes on the paper charts just the same as if there is no ECDIS or is better for the watch officer to use ECDIS the same way that it would be used if the backup was another ECIDS?
This is what Bowditch says in Chapter 7
Until ECDIS is proven to provide the level of safety and accuracy required, the use of a traditional DR plot on paper charts is a prudent backup, especially in restricted waters. The following procedures apply to DR plotting on the traditional paper chart.
But in Chapter 8 it says this:
If the ship is equipped with an ECDIS, it is reasonable for the navigator to simply monitor the progress of the ship along the chosen track, visually ensuring that the ship is proceeding as desired, checking the compass, sounder and other indicators only occasionally.
I know that Transas ECDIS allows bearing and ranges obtained by visual methods or radar to be plotted on the ECDIS. Seems to me that is the way to go, along with such methods as parallel index lines on the radar as well as visual monitoring rather than either the Bowditch chapter 7 or 8 method