GN33 Introduction and safety summary Chapter 1-1
1.1 Introduction and system familiarization
Congratulations on your purchase of SIMRAD GN33 GPS Navigator - a
combination of the latest GPS and SDGPS receiver technology and optional
built-in differential receiver for accurate positioning, plus: detailed cartog-
raphy - all in a unique slim-line design with a bright 6” TFT color or mono-
chrome display.
The GN33 chart system includes a built-in world chart for rough planning
and overview. The choice of chart system best suitable for the GN33 was
carefully singled out to be the C-MAP NT+ mini cards. The optional C-MAP
charts are available world-wide at your local Simrad dealer.
The Global Positioning System is at this time and age the most common
system used for navigation and positioning all over the world. Not only for
maritime use, but also for land-based applications and aviation. The satellite-
based system has been developed and is operated by the US Department of
Defense in order to provide an accurate and reliable service, which include a
24-hour global coverage.
The GPS system consists of approx. 24 satellites which orbit around the Earth
at an altitude of approx. 20,200 km.
The satellites transmit perfectly synchronized data. However, depending on
the position, the signals will reach the receiver at a slightly different time. By
adding the measured time difference to the known position of the satellites it is
possible to calculate the ship’s position to within a few meters.
How to use this manual?
It is a good idea if you make yourself familiar with the key functions, menu
structure and rotation of pages (screens) described in chapter 2 before you
start out, and then proceed with section 2.7 Initial start-up. For quick location
of a certain term, please check the “Glossary of terms” and the “Index” at the
back of the manual. Also, “How to get started” further on in this chapter will
give you a quick introduction to some of the features you have access to in
your new navigator and chartplotter.
The display examples shown in this manual are not always an exact copy of
what you will see on the screen, as the presentation depends on your system
configuration and choices of setup. If your GN33 is the monochrome version,
the color features described in this manual will appear in black, white, and
grey scales.
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