JRC also makes a unit. It uses 2 antennae. Costs about $3,000. Read an
interesting article about these on one of the boating websites. The Furuno
unit has 3 antennae and can calculate additional information, for example,
roll period.

"BOEING377" wrote in message
...
When will GPS compasses come down in price? Just came from the bridge of
an APL
container ship where they had two Sperry GPS compasses. They have replaced
mech
gyros on many ships and are very accurate and responsive. Cost about
$17,000.00
each.