Dual frequency OVA Fish Finder is made by nantong saiyang electronics co. ltd.

Why a Dual Frequency Sonar Outperforms Single-Frequency Units

Most budget fish finders force you to choose: high frequency for detail in shallow water, or low frequency for depth and coverage. The OVA eliminates that trade-off.

This is a 50/200 kHz dual-frequency system built for commercial fishing, survey support, and serious offshore angling. You get two acoustic beams operating simultaneously:

Frequency	Beam Characteristic	Best For	Typical Range
200 kHz	Narrow cone, high resolution	Target separation, bottom composition, individual fish arches near structure	Up to 60 m (200 ft)
50 kHz	Wide cone, deep penetration	Locating large schools, surveying broad areas, penetrating thermoclines	150 m+ (500+ ft)

The practical result: Spot a deep school on the 50 kHz wide view, then zoom using the 200 kHz window to see individual target size and density. No second unit needed.

Key Specifications That Matter on the Water

Unlike consumer-grade models, the OVA FP1021S is built with commercial-grade sonar processing and industrial power options.

Sonar Engine

Output power: 1000–1500W (adjustable)

Pulse length: 0.12 – 3.0 ms (adapts to depth automatically)

Depth rating: 0 – 2000 m (tested beyond typical fishing ranges)

Measurement accuracy: ±0.1 m

Display & Interface

Screen: 10" Color TFT LCD, 800x600 resolution

Brightness: High-brightness with anti-glare (readable in direct sun)

Keypad: Tactile button interface (works with wet or gloved hands)

Connectivity & Power

Voltage: 12–36V DC (direct connection to 12V, 24V, or 32V vessel systems)

Transducer ports: 3 independent ports

NMEA 0183: Inputs (GGA, RMC, VTG) / Outputs (DPT, DBT depth strings)

SD card slot: Log sonar data, replay trips, update firmware

Optional temp sensor: Via temperature-sensing transducer

Environmental

Operating temperature: -10°C to +40°C (14°F to 104°F)

Sealed housing: Rated for marine exposure (salt spray, humidity)

Advanced Features You Actually Use

The FP1021S includes DSP (Digital Signal Processing) and adjustable parameters that inexpensive fish finders hide or omit.

Noise Rejection & Clarity

STC (Sensitivity Time Control): OFF/L/M/H – Reduces near-field clutter from surface bubbles or turbulence.

TX Power control: OFF/L/M/H – Dial down output in shallow water to avoid false echoes.

Clutter filter: Removes plankton or aeration artifacts without losing fish targets.

Target Tracking & Alarms

Fish school alarm: Small / Large – Audible alert when fish density crosses your set threshold.

Depth alarm: In range / Out range – Warns if bottom rises suddenly (reef, wreck, or shallow bank).

Voltage alarm: Monitors supply drop below 10.5V (common on aging battery banks).

Zoom & Expansion Modes – Not Just a Simple Zoom

Mode	Function
Bottom Lock	Keeps bottom at fixed position on screen; shows fish just above the seabed without scrolling.
Auto/Manual Zoom	Expand any depth segment (2x, 4x, 8x, or actual pixel-for-pixel resolution).
A-Mode (A-Scope)	Real-time amplitude display – verifies signal strength and target hardness.

You also get 7 selectable picture advance speeds (stop, 1/8, 1/4, 1/2, x1, x2, x3). Slow speeds for bottom scrutiny, fast speeds for trolling or drift fishing.

Who Should Install an OVA FP1021S?

This is not a recreational kayak unit. The FP1021S fits three use cases:

Small commercial fishing vessels (gillnetters, longliners, crabbers) needing dual-frequency on a budget.

Workboats & pilot boats requiring independent depth sounder with NMEA output to chart plotter.

Serious offshore anglers running 24V or 32V systems who want a dedicated sonar display separate from MFD.

Compare to: Furuno FCV-628 / FCV-588, Garmin Striker Vivid 9sv, Lowrance HDS Live. The FP1021S competes on raw power (1500W peak), dual-frequency simultaneity, and industrial voltage range.

What's in the Box? (Typical Configuration)

FP1021S display unit with bracket mount

Dual-frequency transducer (50/200 kHz, with cable length for wheelhouse-to-hull routing)

Power cable (12–36V DC)

Mounting hardware and gasket

Quick start guide (English/Chinese/Korean/Vietnamese)

Optional: Temperature-sensing transducer, spare cable, flush-mount kit.

Technical Limitations – Read Before Buying

No CHIRP. This is a fixed-frequency (50/200 kHz) unit. CHIRP offers better resolution but costs 3-5x more.

Display is 800x600 (WVGA), not 1080p. Sufficient for sonar graphs; not a multi-media screen.

NMEA 0183 only (not 2000). Works with older autopilots and plotters; requires a gateway for N2K.

Transducer included is a standard bronze or plastic thru-hull / transom mount (confirm type with sales).

If you need side-scan, CHIRP, or wireless phone connectivity – look elsewhere. If you need reliable, high-power dual frequency at a commercial price – the OVA delivers.

Company Background – Nantong Saiyang Electronics

Established 2003.
ISO9001 & China CCS (Classification Society) certified.
Production facility: 3500 m² with in-house transducer manufacturing.

Saiyang sells through 100+ domestic dealers and exports globally. Primary products include ultrasonic transducers, echo sounders, AIS, and electronic chart systems. The OVA series represents their commercial sonar line, not entry-level consumer goods.

Ordering & Customization

Languages: Chinese, English, Korean, Vietnamese (others available on request)

Transducer types: Thru-hull, transom, or in-hull (specify when ordering)

Cable length: Standard 10 m (extensions available)

Hot Tags: OVA FP1021S, dual frequency fish finder, 50/200 kHz sonar, commercial echo sounder, NMEA depth sounder, Saiyang Marine, 10 inch fish finder, 1500W sonar.

Technical parameters：

Model	FP1021S
TX Frequency	50&200KHz
Output Power	1000W-1500W
TXRate	0.12~3.0ms
Accuracy	0.1m
Sensitivity	-95dBm
Alarm	Depth,Voltage,Temperature
Language	Simplified Chinese, English, Traditional Chinese
Display Unit
Display Mode	Dual frequency,Single frequency (high or low freq.), A-scope, Zoom(high or low freq.)
Expansion Mode	Auto Expansion,Manual Zoom,Bottom Lock
TXRate	7 steps(stop,1/8,1/4,1/2,1/1,2/1,3/1)
Color	Echo color:5 color schemes Background color：black, blue
Interface
Input data	IEC61162-1(NMEA0183)RMC, GLL
Output data	IEC61162-1(NMEA0183)DPT, DBT(After GLL and RMC Input)
Serial port to print	Suitable for printer DPU-414
Power Supply	DC 24V(11-35V)
Environmental
Operating temperature	-10℃~+40℃ Compliance with IEC60945 standard
Working humidity	10~90%

 

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