Acura 2009 MDX User Manual download pdf (Page 113)

112 Navigation System

System Limitations

Although your navigation system is one

of the most highly sophisticated pieces

of equipment you will find in a modern

automobile, you may find during its use

that it has certain limitations.

The system uses signals from the Global

Positioning System (GPS) to aid in

determining its current location. The

GPS is operated by the U.S.

Department of Defense. For security

reasons, there are certain inaccuracies

built into the GPS that the navigation

system must constantly compensate for.

This can cause occasional positioning

errors of up to several hundred feet.

For example, in urban areas where

streets are close together, this could

cause the system to show that you are

traveling on a street that parallels the

street you are actually on. The system

will, under most circumstances, correct

itself while you drive.

Depending on your current view of the

sky and the position of the satellites, the

elevation may be shown incorrectly.

You may also notice some delay of the

vehicle position icon at intersections;

this is normal.

GPS Reception Issues

The signals received from the GPS

satellites are extremely weak (less than

a millionth of the strength of a local FM

station) and require an unobstructed

view of sky. The signal can easily be

interrupted or interfered with by the

following:

• Aftermarket metallic window tint

above or to the sides of the GPS

antenna (located under the

dashboard)

• Cell phones, PDAs, or other

electronic devices docked in a cradle

or lying loose on the dashboard

• Radar detectors mounted on the

dashboard

• Remote starters, or “hidden” vehicle

tracking systems mounted near the

navigation unit

• Other aftermarket audio electronic

devices mounted near the navigation

unit

• Trees, tall buildings, freeway

overpasses, tunnels, or overhead

electrical power wires

Although the system will direct you to

your desired destination, it may not

always generate what you consider to be

the most direct route. Try changing the

method of routing. See Changing

Routing Method on page 52. You may

also have Unverified Area Routing set

to OFF. See Unverified Area Routing on

page 93.

Additionally, the mapping database

contains verified and unverified maps.

See Map Overview on page 6.

A Disclaimer screen will warn you if

your route includes unverified streets.

Unverified streets may be missing from

the map, in the wrong location, or have

an incorrect name or address range.

Exercise additional caution when

driving in these unverified areas.

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