INVOF

AcronymDefinition
INVOFIn the Vicinity Of
References in periodicals archive ?
Aspen-Pitkin's (KASE) Chart Supplement entry notes "Hang gliders, para gliders, hot air balloons and gliders on and invof up to 18,000' MSL." Also: "All adverse wx situations magnified in mountains," "Terrain will not allow for normal tfc patterns," and "High rates of descent may be rqrd due to terrain and lcl procedures." And on and on; read it in wonder.