High-end avionics upgrades are far from easy nor inexpensive—while a misstep in the planning process, including the selection of the shop, can send the retrofit in the wrong direction. As an example of how to do it right, this month’s Panel Planner 101 Live field report looks at a flagship Garmin upgrade for a Cessna T210, with examples of how to save money along the way by making use of existing equipment that still provide utility.