A pilot begins their training flying under Visual Meteorological Conditions (VMC) which means always having an outside reference and flying in good weather conditions. An Instrument Rating allows the pilot to fly without reference to the ground and in Instrument Meteorological Conditions (IMC). This gives the pilot the ability to fly into areas of marginal weather and allows greater flexibility when flight planning. The Instrument Rating is also useful if pursuing a career in aviation as for most jobs it will be a requirement. The instrument training may be conducted in either a single engine aircraft (group 3) or a multi engine aircraft (group 1). A group 1 is a requirement for an Airline Transport Pilot Licence.