Understanding Electronic Charts - NorthStar 958 Operator's Manual

Chapter 4 - Using the Chart Screen

Understanding electronic charts

Chart boundary
Chart details
Page 38
Each Navionics chart cartridge contains electronic chart data
from several paper charts. Electronic charts have much of the
information from the original paper charts, although spot
depth soundings, some nav aids, and other data may be
missing. When used with caution, electronic charts open up a
world of navigational accuracy and simplicity.
Don't become overly confident when using electronic charts.
Always be cautious!
The 958 displays the boundary line of each chart on the
CHART screen. To turn this feature off, press the CHART
lines
SETUP key on the CHART screen, then press the CHART
DETAIL key and turn off the CHART EDGES option.
If you move from a highly detailed chart to a less detailed one,
you may see a sudden change in the detail shown on the
screen, just as if you had changed from one detailed paper
chart to a less detailed one. You may be able to use the
displayed boundary lines to predict when this change in detail
is going to happen.
CAUTION!
958 Operator's Manual, Rev. A