TomTom seems to be ramping up its plan to challenge Here, the incumbent leader in the automotive mapping market, with a string of announcements last week. It comes as battle lines continue to be drawn in the industry, which is being rocked by major shifts in the supply chain. TomTom, once a leader (with Garmin) in portable navigation devices, has been overshadowed by smartphone apps and by Here, once owned by Nokia and now by three German carmakers. But it has not given up, and has recently partnered with Chinese search giant Baidu; added western Europe to its HD Map coverage; and unveiled a proof of concept (PoC) with Cisco that uses lasers and fiber optic cables to monitor cars…