Navigation visitors that do pre, post, or custom navigation.

导航访问者，执行向前、向后或自定义导航。

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This code rewrite the existing navigation Block with our custom navigation.

此代码重写现有的导航块与我们自定义的导航。

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These include custom-made navigation tools and night vision systems.

其中包括定制的导航工具和夜视系统。

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The Magellan eXplorist 510 Marine Edition provides boaters with a custom selection of best-in-class Navionics marine navigation charts and data plus a rugged, waterproof handheld Magellan eXplorist 510 Outdoor GPS device featuring easy-to-use menus, a built-in camera and a 3-inch sunlight-readable color touchscreen.

ENGADGET: Magellan eXplorist 510 Marine Edition sets sights on boaters, out in time for Talk Like a Pirate Day