Study notes that cite the rule
Every regulation is tied to the section it comes from — the CAR, the TC AIM paragraph, the FTGU chapter — so you learn the source, not a paraphrase of it.
Day VFR in uncontrolled airspace below 1,000 ft AGL: 2 miles flight visibility and clear of cloud CARs 602.115(c). At night that becomes 3 miles 602.115(c)(ii).
