Development Guide

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Specifying the GPS mode

You must specify the GPS mode to retrieve the location of a BlackBerry device. GPS modes include autonomous, assisted and cell site.

  • Autonomous mode relies on GPS satellites only.
  • Assisted mode relies on GPS satellites and servers on the wireless network.
  • Cell site mode relies on the geolocation service, or the wireless network to provide the location information of the current base station.

GPS modes

Your BlackBerry device application must verify that a GPS mode is available for use on each BlackBerry device that your application runs on, before your application can use the GPS mode.

GPS mode

Description

cell site

This mode uses the wireless network to achieve the first GPS fix, and is generally considered the fastest mode. This mode does not provide BlackBerry device tracking information such as the speed and the bearing.

autonomous

This mode uses the GPS receiver on the BlackBerry device to retrieve location information. This mode cannot be used indoors or in close proximity to many physical obstructions, and it can take several minutes to fully synchronize with four or more satellites for the first GPS fix.

assisted

This mode uses the wireless network to retrieve satellite information. This mode can achieve a fast retrieval of the first GPS fix.

MS-based

This mode uses the wireless network to retrieve satellite information. After the first GPS fix, the BlackBerry device relies on the autonomous mode to more accurately retrieve subsequent GPS fixes. The MS-based GPS mode applies to BlackBerry devices that use the Qualcomm gpsOne and operate on the CDMA network.

MS-assisted

This mode uses the wireless network to retrieve satellite information. This mode applies to BlackBerry devices that use the Qualcomm gpsOne and operate on the CDMA network.

speed optimal

This mode focuses on providing the fastest possible GPS fix that meets the criteria that is set by the application. This mode applies to BlackBerry devices that use the Qualcomm gpsOne and operate on the CDMA network.

accuracy optimal

This mode is determined based on the accuracy of a GPS fix. This mode either relies on network information, or performs local calculations, depending on what is the most accurate and available. This mode applies to BlackBerry devices that use the Qualcomm gpsOne and operate on the CDMA network.

data optimal

This mode is determined based on the least amount of network traffic that is required for a GPS fix. This mode either relies on network information, or performs local calculations, depending on what is available that uses the least amount of data traffic. This mode applies to BlackBerry devices that use the Qualcomm gpsOne and operate on the CDMA network.

Bluetooth enabled GPS

This mode is determined by the configuration of the Bluetooth enabled GPS device. The configuration of a Bluetooth enabled GPS device that is paired with a BlackBerry device cannot be specified in a Criteria object.

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