Raymarine E-Series, User Reference Handbook

Page: 244 / 260

Item Description
1 Sky view — a visual representation of the position of tracked
satellites.
2 Horizontal Dilution of Position (HDOP) — a measure of
GPS accuracy, calculated from a number of factors including
satellite geometry, system errors in the data transmission and
system errors in the GPS receiver. A higher figure signifies a
greater positional error. A typical GPS receiver has an accuracy
of between 5 and 15 m. As an example, assuming a GPS
receiver error of 5 m, an HDOP of 2 would represent an error
of approximately 15 m. Please remember that even a very
low HDOP figure is NO guarantee that your GPS receiver is
providing an accurate position. If in doubt, check the displayed
vessel position in the chart application against your actual
proximity to a known charted object.
3
Fix status — indicates the actual mode the GPS receiver is
reporting (No Fix, Fix, D Fix or SD Fix).
4 Datum — The GPS receiver’s datum setting affects the
accuracy of the vessel position information displayed in the chart
application. In order for your GPS receiver and multifunction
display to correlate accurately with your paper charts, they must
be using the same datum. Refer to the Using the Chart chapter
for more information.
5 Mode — the mode currently selected by the GPS receiver.
6
Satellite status — displays the signal strength and status of
each satellite identified in the Sky view diagram on the left of
the screen.
The accuracy of the GPS receiver depends on the parameters
detailed above, especially the azimuth and elevation angles which
are used in triangulation to calculate your position.
244 E-Series Widescreen User reference