OK...I'm probably missing a very simple step, but I'm at the point where I can't figure out why-in-the-heck I keep getting the attached error when trying to build tracks from AIS point data. Sure, it's a super big file (~25,000,000 records, nearly 3 GB) but I can't imagine that would be the problem. Anyone got tips with working with the Marine Cadastre annual AIS point data files? I've been trying to build better tracks (fewer gaps) than those created with the tools on the Marine Cadastre AIS line files by starting with the point data myself.