Zooming In And Out - NorthStar 958 Operator's Manual

Zooming in and out

958 Operator's Manual, Rev. A
To get a closer look at the chart area around your vessel or
around the cursor, press the IN key to zoom in. To see a wider
area, press the OUT key to zoom out. Each press of the IN or
OUT key approximately halves or doubles the chart scale,
respectively.
At the highest detail for a particular chart, you can use the 958
as a precision plotter. When you zoom in past that level, the
center of the chart is magnified to fill the screen and all text
and symbols are doubled in size. Zooming in still further
causes the 958 to remove all chart detail from the screen for
safety reasons, leaving only your vessel, its track, user-entered
waypoints, and the lat/lon grid.
Chapter 4 - Using the Chart Screen
Page 41