boaters notice that their electronic chart doesn't duplicate a
particular feature shown on the paper chart they're using. The
reason is this: Offshore G-charts and Navionics use all the best
charts available and carefully turn the paper charts into a digital
format for display on electronic chart plotters. If there are
errors, omissions, or discrepancies on paper, they may occur electronically
On paper charts,
sometimes even large features like a breakwater may not be shown
clearly or at all. Large breakwaters are sometimes not shown on
the harbor charts, but are shown on coastal charts-or vice versa.
These decisions are made by the chart maker, NOAA/NOS.
In some cases,
bridges or other features washed away in storms decades ago are
still shown on the paper charts. Recent changes in coastlines
are often not reflected on paper charts for years. The same is
true for new marinas and ports. Sometimes well-known local landmarks
may be shown so small on the paper chart that they are indistinguishable
from surrounding features to someone not familiar with the area.
In these cases, a feature may not be accurately depicted on the
a feature is shown on the paper chart, it can be overlooked or
misspelled in the data entry process. Or a small defect in
coastline graphics produces a "filling" effect on one particular
screen. These are small problems that can be easily corrected
on the next update, and do not affect the quality of the overall
If you notice
something missing on your electronic chart, first check the best
available scale paper charts of the area to see how the feature
is represented on the paper chart. If we have not represented
it accurately, or you know additional information about the feature,
give us call at your earliest convenience. We will need to know
the chart number, chart maker, and latitude/longitude of the feature
along with any other information you can provide. On our next
update, we will correct the problem.