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How it works
Simply,
C.A.R.D.
is a passive instrument that reads transmitting radar. Properly
installed, C.A.R.D. will receive signals from as far away as 5 - 8 nautical miles,with
most merchant ship traffic.
 For example, a ship is heading towards you off the starboard
beam. On the C.A.R.D. monitor, the starboard display bar will light, indicating the
direction.
If the ship heads to 135 degrees starboard, the starboard and aft lights will both shine
-- again, indicating the direction.
Your permanent position is in the center, marked by a bright, green light.
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