The answer: OsmAnd's custom-built Highway Hierarchy (HH) Routing. This isn't your standard routing engine; it's a ground-up redesign, meticulously engineered to overcome the unique challenges of providing advanced navigation on compact, offline-first map data.
By the early 1960s, with ERMA on the scene, IBM's started to catch up.
，详情可参考搜狗输入法2026
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