All models have the ability to upgrade to Garmin navigation via a special app (available on the Apple iTunes Store), which downloads the mapping database directly onto an iPhone 4 or 4s and allows for instantaneous routing and re-routing without the need for continuous 3G, 4G or LTE service, avoiding long download times and high data charges.

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It might be better for Apple to hold onto its cash and fix its own internal processes for creating accurate mapping data.

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