southace said..
But now that you brought an incident up involving paper/electronic charts I have to disagree to a certain point!.
The paper charts are only as good as they are if updated. I would say digital updated electronic charts would be more accurate. On this topic how do you update electronic charts? Do navionics up date? I'm sure you should be able to Awnser this loose change as you seem the IT goro!
I agree that any chart is only as good as its last update and given that both paper and electronic charts are expensive to buy and that combined with that most sailors are as tight as a fishes and are therefore loath to spend the money.
The main problems I see with electronic charts is the level of detail varies at different zoom ranges whereas a paper chart only has one layer and the danger is there to see.
Beyond a certain zoom level an electronic chart becomes dangerous because by zooming in, it can increase the chart scale beyond what can be supported by the source data. The constant and automatic update of the vessel’s position on the chart display can give the navigator a false sense of security, causing him to rely on the accuracy of a chart when the source data from which the chart was compiled cannot support the scale of the chart displayed.
The need to update any electronic chart is possibly based more on commercial decisions. For instance, a company is likely to a update a chart more often if the area of chart coverage is in a high traffic area and they are going to sell more charts of that area, than say maybe a more obscure location where only a few ships venture and there is possibly no return on the investment of updating a chart.