The LC Deluxe adds a barometric sensor for more accurate maximum altitude determination. This does not affect the actual detection of apogee, nor is this unit affected by Mach transitions.
The addition of the Barometric sensor also enables use to add an additional output channel for low altitude deployment. Units set for 400’ or 800’ are both available. The Barometer has a maximum detectable altitude of about 38,000 feet MSL, but this affects apogee read-out only, not apogee detection.