Garmin Ltd. has filed two lawsuits against European rival TomTom Inc., claiming the company is using Garmin-patented technology in its GPS devices.

In the suits, filed earlier this month in U.S. District Court in Madison, Wis., Olathe, Kan.-based Garmin says TomTom has infringed on five Garmin U.S. patents protecting technology used in its Global Positioning System devices.