Northstar Explorer 435/438 Installation and Operation Manual 27
Explorer R310: Repeater
for depth, speed, water
temperature and battery
voltage. Accepts NavBus or
NMEA data inputs from other
instruments.
Explorer D210:
Depth Repeater
Explorer 550:
Color GPS
Chartplotter
with worldwide
coverage
6-6 Cleaning and maintenance
Clean the screen only with a damp cloth and mild
detergent when dirty or covered in sea salt. Avoid
abrasive cleaners, petrol or other solvents.
Cover or remove a transom-mounted transducer
when repainting the hull. If painting over a
through hull transducer with antifouling paint, use
only one coat of paint. Remove the previous coat
of antifouling paint by sanding it lightly.To optimize
performance, avoid walking on or jamming cables
and connectors. Keep the transducer free of weed,
paint and debris. Do not use a high pressure water
blast on a speed sensor paddlewheel as it may
damage the bearings.
When not in use, the Explorer 435 or Explorer 438
can be removed from the installation bracket and
stored in the Northstar carry bag, or left on the
installation bracket and securely covered with the
sun cover.
Depth range
• 2 ft (0.6 m) to 600 ft (180 m).
Display type
• TFT Color.
• Screen resolution 320 high x 240 wide (pixels).
• LED multi-level backlighting.
Supply voltage
• 10 to 16 V DC.
Supply current at 13.8 V
• 300 mA min - no backlighting.
• 400 mA max - full backlighting.
Output power
• Variable, up to 200 W RMS.
Operating temperature
• 32° to 122°F (0° to 50°C)
Transom transducer cable length
• Explorer 435 33 ft (10 m).
• Explorer 438 26 ft (8 m).
Typical depth acquisition time from startup
• 2 seconds at 100 ft (30 m).
Receiver sensitivity
• Better than 10 micro volts RMS.
• Dynamic range 4.0 million to 1 (120 dB).
Temperature measurement range
• 32° to 99.9°F (0° to 37.7°C)
Resolution of 0.1° unit.
Transducer frequency
• 200 kHz.
Appendix A - Specifications
Speed range
• 1 to 50 kn (57.5 mph, 96.6 kph).
Standards Compliance
• EMC:USA FCC Part 15 Class B.
Europe (CE) EN50081-1 and EN50082-1
New Zealand and Australia (C Tick)
AS-NZS 3548.
· Environment: IPx6, IPx7.
NMEA Output (Explorer 438 only)
NMEA 0183 (Ver 2.0) 4800 baud is a standard
for interfacing marine electronic devices. The
Northstar fishfinder can output the following
sentences:
• DBT (Depth Below Transducer)
• DPT (Depth and Keel offset)
• MTW (Water temperature)
• XDR (Battery voltage and fuel flow).
• VHW (Speed)
Fuel Computer (Explorer 438 only)
(optional fuel transducer(s) required)
• Outboard carburetted two stroke and EFI
petrol/gasoline engines: 30 to 300 hp.
• Outboard four stroke petrol/gasoline engines:
90 to 300 hp.
• Inboard petrol/gasoline engines: 50 to 300 hp.
• Minimum flow rate: 1.3 U.S. gallons per hour
(5 litres per hour).
• Maximum flow rate: 34 U.S. gallons per hour
(130 litres per hour).