November 26, 2009 17:27
1) Neither raster nor vector charts have "priority". Charts for each area are selected based on chart's native scale and zoom level you pick. That said, in the NOAA chart set it just so happens that raster charts often have "larger" scale than corresponding vector charts. As such, they are often selected to be shown when two charts are available.
You can turn on and off individual charts in the chart manager (use "+" and "-" buttons to toggle them). Better chart management is on a TODO list.
2) It is not particularly unusual for charts, especially vector charts of different scales, not to match exactly. Chart data is collected from different sources (often scanned from RNC charts) and charts of smaller scale tend to remove some detail in order to accommodate larger area. In your example it appears that chart cell above/left is of a smaller scale and has a more approximate shoreline than the one below/right.
Generally speaking for close quarters navigation you want to use the largest scale chart available for the location.
3) Exclamation mark in a triangle generally marks various restricted areas or "caution" notes. You can find out more about it by opening chart information window (Cmd+I) and clicking on the sign location.
4) Visible chart scale is on TODO list as well. It's a small item but it is relatively difficult to "get right", and a number of other products do not. I'd like to avoid the pitfalls and get it done in the most reasonable way.
You can turn on and off individual charts in the chart manager (use "+" and "-" buttons to toggle them). Better chart management is on a TODO list.
2) It is not particularly unusual for charts, especially vector charts of different scales, not to match exactly. Chart data is collected from different sources (often scanned from RNC charts) and charts of smaller scale tend to remove some detail in order to accommodate larger area. In your example it appears that chart cell above/left is of a smaller scale and has a more approximate shoreline than the one below/right.
Generally speaking for close quarters navigation you want to use the largest scale chart available for the location.
3) Exclamation mark in a triangle generally marks various restricted areas or "caution" notes. You can find out more about it by opening chart information window (Cmd+I) and clicking on the sign location.
4) Visible chart scale is on TODO list as well. It's a small item but it is relatively difficult to "get right", and a number of other products do not. I'd like to avoid the pitfalls and get it done in the most reasonable way.