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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Raymarine

Raymarine ST900/P120 Speed & Temp Thru-Hull Transducer Retractable w/13.7M (45') Cable

Manufacturer: RaymarinePart #: E70673SKU: 107014

40°
Thru Hull
Bronze

$239.58● In stock

Item #: 107014

Category: Transducers

● In stock — ships fast from US warehouses

Ships from US warehouses
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Description

ST900/P120 Speed & Temp Thru-Hull Transducer Retractable with 13. 7M (45') Cable Speed performance has been taken to the next level with the ST900 Speed/Temperature sensor.

Featuring the new Gen2 Paddlewheel, the ST900 outperforms all other paddlewheel sensors for responsive startup and linearity. The Gen2 Paddlewheel begins delivering accurate speed reporting as low as 0.

3 knots and maintains smooth speed output through 45 knots. Available with a plastic or bronze transducer housing, they sit nearly flush with the boat's hull and minimize drag with only 5mm (3/16") extending outside the hull.

The housing has a valve assembly that helps to minimize water ingress in the bilge when the sensor is removed for routine maintenance of the paddlewheel. Features: Speed and fast-response water temperature sensor Analog output for use with Raymarine instruments like i40, i50, iTC-5, and legacy systems Retractable for easy maintenance ST900 transducer core is retrofittable into existing Airmar P120 and B120 transducer housings Specifications: Plastic Hull Material: Fiberglass/Metal Cable Length: 13.

7M (45') Records: Speed/Temperature Hole Size: 51 mm (2") Mounting Style: Low Profile Thru-Hull Speed Range: 0. 3 to 45 knots (.

34 to 52 MPH/. 55 to 83 KPH) Temperature Range: -10° to 40°C (14° to 104°F)

Specifications

Brand	Raymarine
Part Number	E70673
EverTide SKU	107014
UPC	723193846940
Mount	Thru Hull
Material	Bronze
Beam Angle	40°

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

Compare similar products

	Raymarine ST900/P120 Speed & Temp Thru-Hull Transducer Retractable w/13.7M (45') Cable$239.58You're viewing	Raymarine B175H-W 20° Bronze Thru-Hull Tilted Element Transducer - 1kW$1579.00	Raymarine B175M Bronze CHIRP 0° Thru-Hull Transducer$1405.22	Raymarine B265LH 1kW Bronze Thru Hull w/Temp$1999.00
Frequency	—	—	130 kHz	—
Mount	Thru Hull	Thru Hull	Thru Hull	Thru Hull
Material	Bronze	Bronze	Bronze	Bronze

Complete your setup

Raymarine

Raymarine B60-20, 20 Degree Tilted Element Transducer f/DSM300 / DSM300G / DSM250 / DSM30

$389.00

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.

Raymarine 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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