Operation; Gps Maps On Microsd Cards; Answering A Phone Call While Using Gps; Losing The Gps Signal While In A Vehicle - Motorola MC55 User Manual

3 - 2 MC55 User Guide
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.
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.

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

Answering a Phone Call While Using GPS

If you receive a phone call while using your GPS navigation software:
Answer the phone call by pressing the Answer button.
1.
Once you end the phone call, press the End Call button to resume the audio on the GPS software.
2.
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.

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 ordinarily
have to download from the GPS satellites. With the aGPS data, GPS receivers can operate faster and more
reliably.
Refer to the EMDK Help file for information on setting up SUPL on the MC55.
Installing a microSD Card on page 1-4.