Motorola MC55N0 Uživatelská příručka stáhnout pdf (Strana 80)

3 - 2 MC55 User Guide

2. In the Programs tab, the GPS program port is set to None.

3. In the Hardware tab, the GPS hardware port is set to COM8.

To access the GPS receiver from multiple programs simultaneously, the user can either use the Microsoft GPS API

or change the GPS program port setting and access the GPS program port in the multiplexed way.

Operation

Acquiring satellite signals may take a few minutes. It is best to be outside and have a clear, unobstructed view of

the sky. Without a clear view, acquisition takes much longer and could result in the MC55 being unable to compute

the initial position quickly. When operating the device indoors access to the GPS signals may be limited or

unavailable.

GPS Maps on microSD Cards

GPS navigation software vendors may sell maps on microSD cards. If using a microSD card with the GPS

navigation software install the microSD memory card using procedure in Installing a microSD Card on page 1-4.

Answering a Phone Call While Using GPS

If you receive a phone call while using your GPS navigation software:

1. Answer the phone call by pressing the Answer button.

2. Once you end the phone call, press the End Call button to resume the audio on the GPS software.

Losing the GPS Signal While in a Vehicle

GPS performance on the MC55 may be affected if the vehicle has thermal glass windows and windshields, which

can block the MC55 from receiving a GPS signal from satellites. To improve GPS signal strength, place the MC55

where there is a clear view of the sky. A direct line of sight is required between the MC55 and the GPS satellites to

access information from the satellites.

Assisted GPS

GPS can be used in stand-alone or Assisted GPS (aGPS) modes. A Stand-alone GPS receiver downloads data

directly from GPS satellites. In challenging environments, such as urban canyons and areas where foliage is very

dense, aGPS can be used to improve Time To First Fix (TTTF). By default the MC55 uses the SUPL protocol

which requires the use of third party database/service from a carrier. By using GPS Location servers, A-GPS

dramatically improves the performance of the TTFF of GPS receivers by providing them with data that they would

NOTE When using a GPS navigation application, ensure that the MC55 does not go into suspend mode. If the MC55

suspends then the power to the GPS radio is removed. Upon resume the GPS receiver must reacquire a valid GPS

signal, resulting in a a delay of positional information.

NOTE Anytime you are using GPS on the MC55 and you receive a phone call, the audio on the GPS navigation software

is muted until you finish the call.

NOTE On devices with OEM version 03.38.0004, to configure the MC5574 to obtain GPS data from a SUPL server

see Assisted GPS on page C-18 for more information.

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Motorola MC55N0 Uživatelská příručka Strana 80