New Delhi, Nov. 7 -- A dash camera is one of those gadgets you hope never to need and the one you will be very glad to have if a dispute or a scrape happens. The trouble starts when you open a shopping page and meet a wall of jargon: loop recording, G-sensor, GPS, parking mode, WDR. Some of these features save your best footage; others mostly pad out the listing. Here in this article, I'm going to explain what each one does in plain language, which ones deserve your money and the practical details, like memory cards and Indian summer heat, that decide whether your footage is actually useful when it counts.

A dash cam records constantly while you drive and a memory card fills up quickly. Loop recording solves this by saving footage in sho...