I emailed John Glaisyer of ARNAV Systems, Inc. to ask about the current status of the ICDS 2000 capabilities in the SR20. Below is his reply, which he graciously consented to let me post (Thanks, John).
"Here is the latest we have on other upgrades to the ICDS 2000:
"Our Terrain and obstruction application is standard on the ICDS 2000.
"The WX500 interface is available now.
"The engine monitoring should be available in your SR20 first quarter of 2001 and weather in the second quarter. I understand Cirrus will be making retrofit kits available if you take delivery of your SR20 before one of the above features is available.
"We should eventually support both the Ryan TCAD and B.F. Goodrich Skywatch, TCAD being first. The engineers at Cirrus are currently working to find locations for the antenna(s) for both systems. I don’t have an estimate on the time of availability for these two interfaces.
“We, at both ARNAV and Cirrus, are working hard to make all the features every customer is waiting for available with a minimum of inconvenience.”
As I didn’t know much about the Terrain and Obstruction application he mentioned, I asked him for more information. His response was clear and enlightening:
"The Terrain Obstruction Proximity System or “TOPS” is standard on all ICDS 2000’s and compares your GPS position and altitude from your mode C encoder with an elevation and obstruction database contained on the ICDS 2000 data card. It provides you with the highest obstruction within five (5) minutes flying time (based on your GPS ground speed)360 degrees around your
aircraft, “Look Around” and a 60 NM “Look Ahead”.
"The “Look Around” feature presents two lines of information in a box in the upper right hand corner of your display. The top line lists aircraft altitude (ALT) and the second, the elevation of the highest obstruction in the protected zone (OBS). In the event the aircraft is at or below the obstruction, the “OBS” information turns red and the elevation of the
obstruction on the moving map also turns red and an amber cross is put next to the obstruction.
"The “Look Ahead” window is displayed in the top center of the display and depicts a side view of the aircraft and compares the relative height of the aircraft to the terrain for a distance of 60 NM in front of the airplane (currently displayed in four 15 NM sectors, 4 NM’s either side of your
projected track). Once again, the ICDS compares your GPS position and altitude from your mode C encoder with the elevation and obstruction
database and if the elevation in any of the 8 by 15 NM sectors contains an elevation of obstruction within 500 feet of your altitude, that sector will turn to red, indicating a possible CFIT conflict."
Thanks again to John for this excellent description of this very useful function.