Industry analysts estimate that sales of PNDs will grow from approximately 14 million units in 2006 to approximately 56 million units in 2011.

行业分析家估计，个人导航设备的销售量将从2006年的大约1400万部，增加到2011年的大约5600万部。

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Furthermore, the In-Sights provides shipment forecasts for 2005-2010 for these market segments: PNDs, HNDs, and GPS-enabled handheld devices.

此外，这份报告提供了对这三类细分市场从2005到2010的出货量预测。

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These tools include both built-in systems and Personal Navigation devices (PNDs), which are handheld devices that users can carry with them and use in their vehicles.

这些工具包含内置系统和个人导航设备(PND)，这两个设备都是手持设备，使用者可以随身携带，并能在车内使用。

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He contends, however, that PNDs still offer some advantages, including larger screens, higher-quality speakers and more accurate GPS receivers.

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