Garmin GPSMAP 400 series Pilot's Manual Addendum - Page 19

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All information in this section pertaining to the display and control of the Ryan 9900B TCAD also

applies to the Ryan 9900BX TCAD except for the following:

• TCAS-like symbology is used in the 9900BX as opposed to the 9900B (similar to SKYWATCH).

• Altitude modes are available similar to SKYWATCH (normal, look up, look down, unrestricted).

• Ranges are manually controlled instead of being automatically re-sized to the current shield.

• Trafﬁ c display range selections are different:

• Ryan 9900B— range is slaved to current shield size.

• Ryan 9900BX— 2 nm, 2 and 6 nm, 6 and 12 nm, 12 and 24 nm.

Refer to the Ryan TCAD Pilot's Guide for a detailed description of the Ryan TCAD System.

The Ryan TCAD (Traffic and Collision Alert Device) is an on-board air traffic display used to identify

potential collision threats. TCAD computes relative altitude and range of threats from nearby Mode C and

Mode S-equipped aircraft. TCAD will not detect aircraft without operating transponders and those that

are beyond radar coverage. TCAD, within defined limits, creates a shield of airspace around the aircraft,

whereby detected traffic cannot penetrate without triggering an alert.

SECTION 4

RYAN TCAD INTERFACE

Section 4

Ryan TCAD Interface

See the Ryan TCAD Pilot's Handbook for a

description of the trafﬁ c symbols.