What’s the difference between a chartplotter and a fishfinder?

A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.

Do I really need a VHF radio?

For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.

What is NMEA 2000 and do I need it?

NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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Airmar

Airmar DT800 NMEA 2000 Thru-Hull Tilted Element Smart Sensor - 20°

Manufacturer: AirmarPart #: DT820PV-235-N2SKU: 70692

100W
235 kHz
5-pin
20 ft
Thru Hull

$399.99$439.99Save $40.00 (9%)● In stock

Item #: 70692

Category: Transducers

● In stock — ships fast from US warehouses

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Description

DT800 NMEA 2000 Thru-Hull Tilted Element Smart Sensor - 20° Function: Depth / Temperature, Material: Plastic, Fixed Tilt Angle: 20° Frequency: 235 kHz, Cone: 12°, Power: 100 Watts RMS Connector: 5-Pin NMEA 2000 Features: Low-profile, retractable, thru-hull transducer offers depth and temperature functions in a single, compact housing Tilted Element Transducer – unique design tilts ceramic element inside transducer housing, giving all the advantages of a fairing block without a hull protrusion Available in fixed 0°, 12° or 20° tilt – perfect for power and sail boat applications Low-profile housing compensates for hull deadrise, does not affect hull performance and provides accurate readings at high speeds Designed with Airmar's exclusive Broadband Ceramic Technology, 235 kHz element improves resolution without sacrificing sensitivity Smart™ Sensor with embedded microelectronics – transducer element and signal processor are only millimeters apart 235 kHz frequency prevents mutual interference with other echo sounders on vessel Retractable housing with self-closing valve minimizes water flow into the vessel when transducer is removed for servicing Specifications: Mount: Thru-hull Fixed Element Tilt Angle: 20° (for 16° - 24° hull deadrise) Housing Material: Plastic Connector: 5-pin NMEA 2000® Cable Length: 20 ft. Frequency: 235 kHz Cone: 12° Power: 100 Watts RMS Depth Sensor Range: 1.

6 - 594 ft. Acoustic Window Material: Urethane Compatible Hull Materials: Fiberglass or metal Hole Diameter for Installation: 2" Dimensions: 4.

92" H x 2. 94" OD This product may not be returned to the original point of purchase.

Please contact the manufacturer directly with any issues or concerns.

Specifications

Brand	Airmar
Part Number	DT820PV-235-N2
EverTide SKU	70692
UPC	801769002485
Power	100 W
Frequency	235 kHz
Connector	5-pin
Mount	Thru Hull
Cable Length	20 ft

Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.

Compare similar products

	Airmar DT800 NMEA 2000 Thru-Hull Tilted Element Smart Sensor - 20°$399.99You're viewing	Airmar 599 Low/High Frequency - In-Hull Chirp Transducer w/o Connector$6599.00	Airmar B150M Bronze 20 Degree Thru-Hull 300W 8-Pin$459.99	Airmar B164 Bronze Thru-Hull - 50/200 kHz - 1 kW - 12° Tilted Element - Requires Mix & Match Cable$1264.00
Power	100 W	—	300 W	600 W
Frequency	235 kHz	112 kHz	155 kHz	50/200 kHz
Connector	5-pin	—	8-pin	9-pin
Mount	Thru Hull	In Hull	Thru Hull	Thru Hull
Material	—	—	Bronze	Bronze

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Returns & warranty

Returns are accepted within 30 dayson items that are unused and in their original packaging. Some items may be subject to a manufacturer restocking fee. Special-order items may not be eligible — if you're unsure, ask us before ordering.

Airmar productscarry the manufacturer's standard warranty. For a warranty claim or a return authorization, see our full returns policy or contact us.

Marine Navigation & Instruments — frequently asked

What’s the difference between a chartplotter and a fishfinder?: A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.
Do I really need a VHF radio?: For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.
What is NMEA 2000 and do I need it?: NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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