Garmin's portfolio of integrated flight deck upgrades now includes G5000 modernization program for Citation Excel and Citation XLS   OLATHE, Kan, 2016-Oct-31 — /EPR Retail News/ — Garmin International Inc., a unit of Garmin Ltd. (NASDAQ: GRMN), today (October 25, 2016) announced it will expand its portfolio of integrated flight deck upgrades to now include a G5000 modernization…