The letter, authored by Council Members Robert Holden (D–Queens) and Ben Kallos (D–Manhattan), and signed by 20 other council members, questioned why the Education Department didn’t comply with a January law requiring the agency to make real-time GPS tracking available to parents starting this past September. “We...demand that the DOE explain its error and abide by the law immediately for the sake of our students and parents,” the lawmakers said in the note sent Friday. Lawmakers passed a bill in February to shore up city school bus service after frequent delays and missing school buses last year. The law required that the city make real-time GPS data available to “authorized parents or guardians” starting at the beginning of this school year.