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FOREWORD
Congratulations on your choice of the
FURUNO MODEL 821/MODEL 841 Ma-
rine Radar. We are confident you will see
why the FURUNO name has become syn-
onymous with quality and reliability.
For over 40 years FURUNO Electric Com-
pany has enjoyed an enviable reputation for
innovative and dependable marine electron-
ics equipment. This dedication to excellence
is furthered by our extensive global network
of agents and dealers.
Your radar is designed and constructed to
meet the rigorous demands of the marine en-
vironment. However, no machine can per-
form its intended function unless properly
installed and maintained. Please carefully
read and follow the recommended proce-
dures for installation, operation and main-
tenance.
While this unit can be installed by the pur-
chaser, any purchaser who has doubts about
his or her technical abilities may wish to
have the unit installed by a FURUNO rep-
resentative or other qualified technician. The
importance of a thorough installation can-
not be overemphasized.
We would appreciate hearing from you, the
end-user, about whether we are achieving
our purposes.
Thank you for considering and purchasing
FURUNO equipment.

Features

Your radar has a large variety of functions,
all contained in a remarkably small cabinet.
The main features of the MODEL 821/
MODEL 841 are:
• Traditional FURUNO reliability and
quality in a compact, lightweight and
low-cost radar.
• Smartly styled, light-weight and compact
radome antenna fits even on small yachts.
• Durable brushless antenna motor.
• High definition 8" LCD raster-scan dis-
play.
• On-screen alphanumeric readout of all
operational information.
• Standard features include EBL (Elec-
tronic Bearing Line), VRM (Variable
Range Marker), Guard Alarm, Display
Off Center and Echo Trail.
• Watchman feature periodically transmits
the radar to check for radar targets which
may be entering (or exiting) the alarm
zone.
• Operates on 10.2 to 31.2 V DC power
supply and consumes about 40 W.
• Ship’s position in latitude and longitude
(or Loran C Time Differences), range and
bearing to a waypoint, ship’s speed, head-
ing and course can be shown in the bot-
tom text area. (Requires a navigation aid
which can output such data in NMEA
0183 format.)
• Zoom feature provided.