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湖底地图生成功能（Contour/AutoChart类）需要探头具备高精度GPS且要求缓慢均匀走航采集，游钓者偶尔使用意义不大，只有固定水域反复作钓才能沉淀出有价值的等深线图

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Unverified内置GPS支持Quickdraw Contours功能，可在行驶过程中自动绘制1英尺等深线地图并存储航点，适合反复在同一水域作钓逐步积累地形数据84% similar Unverified内置GPS可生成湖底等深线地图是核心卖点，但建图精度依赖多次反复抛投覆盖，单次抛投覆盖面积有限，耐心不足则地图价值大打折扣83% similar Unverified开放水域模式依赖GPS定位，GPS信号在每次划臂出水瞬间采集，因此距离精度不如泳池模式，长距离路线轨迹可能存在漂移79% similar Unverified航海/钓鱼用途必须选内置海图（如BlueChart）或支持水深图的机型，普通陆地版GPS即使防水也不含海图数据，无法显示水深与航道78% similar Unverified近海及远洋航行必须选支持C-MAP或Navionics官方海图的机型，内河船钓建议选带高精度水系图层的机型，两者海图数据格式不兼容，混用会导致关键水深与航道信息缺失76% similar

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