Rhotheta International

What Rhotheta International does

Rhotheta International Inc. is a Fort Lauderdale, Florida-based private company that serves as the master distributor and factory-authorized service center for RHOTHETA Elektronik GmbH, a German manufacturer of radio direction finding (RDF) equipment founded in 1989. The company's core technology is a Doppler-based RDF method in which antenna elements are electrically switched in rapid sequence to simulate circular motion, enabling bearing calculation from Doppler shift at a 3 kHz effective rotation speed. A patented antenna design (1996) integrates the wideband receiver and the DF processor into a single compact housing (4.4 lbs for helicopters, 2.85 lbs for drones). The product portfolio spans five categories — Marine (RT-B77, RT-100, RT-202, RT-300, RT-500-M), Airborne (RT-600-A, RT-600-L, RT-600 Light), VTS (RT-800, RT-1000, RT-1000 MC, 9000-2GM, 9020-2G), ATC, and Portable (RT-400) — with software products smartDF (iPadOS), DF Scout (Android), and DF Commander MK2. All systems cover 118–470 MHz, including international emergency frequencies (121.5, 243, 406 MHz), with Cospas-Sarsat beacon decoding and GPS position data.

The business serves search and rescue (SAR), air traffic control (ATC), vessel traffic services (VTS), and law enforcement customers in the marine, airborne, and portable segments. The customer base is heavily skewed toward government and nonprofit safety-of-life buyers, including the US Coast Guard (175+ vessels over 35 years through the L3 Harris-led FRC program), Civil Air Patrol (450+ aircraft under a 20+ year relationship), Canadian Coast Guard, Chilean Navy, Swedish Police, RNLI, KNRM, DGzRS, and various US law enforcement departments. Rhotheta generates revenue primarily through quote-based hardware sales of complete RDF systems (antenna unit plus display/control unit) and complementary software licenses, with secondary revenue from factory-authorized service, repair, and upgrade activity (48-hour average repair turnaround, 3-business-day warranty repair, 2-year limited warranty).

The go-to-market model combines enterprise field sales to government agencies with a global channel network of regional dealers (covering North/Central/South America, Caribbean, Australia, New Zealand, China, Japan, and Israel), aircraft completion centers (Metro Aviation, Wysong Enterprises), and mission-system integrators (CNC Technologies). Integration with mission management platforms from Churchill Navigation, AeroComputers, CarteNav, and (since 2023) TimeZero, plus ARINC 429 / RS232 / NMEA interfaces, embeds Rhotheta hardware into broader airborne and maritime software ecosystems. Both Rhotheta entities are ISO 9001:2015 certified, and the company reports an installed base of more than 4,500 RT-200/202 family systems and over 100 RT-1000 ATC/VTS systems worldwide.

Name

Rhotheta International

Legal name

Rhotheta International Inc.

Website

https://rhothetaint.com

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

51–100 employees

Short description

Rhotheta International is the US distributor and service center for RHOTHETA Elektronik GmbH's Doppler-based radio direction finding systems, serving coast guards, navies, SAR organizations, ATC providers, and law enforcement agencies across marine, airborne, portable, and VTS applications worldwide.

Ownership category

akta.pro rank

Headquarters

HQ city

Fort Lauderdale

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Personnel, Operations, Marketing or Sales

Revenue model

1. Radio Direction Finder Hardware Sales: Sale of RDF hardware systems including RT-100, RT-200/202, RT-300, RT-400, RT-500-M, RT-600 series, RT-800, RT-1000. Products sold as complete systems with antenna units and display control units for marine, airborne, ATC, VTS, and portable applications.
2. Software Solutions: Sale of software applications including DF Commander MK2, smartDF iPadOS app, and DF Scout Android app for direction finder control and display.
3. Service, Repair & Upgrade: Factory-authorized service center providing warranty repairs, non-warranty repairs, upgrades and overhauls. 48-hour average turnaround on repairs. Warranty repair within 3 business days.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Rhotheta International designs, manufactures, distributes, and services Doppler-based Radio Direction Finding (RDF) and location sensor systems for maritime, airborne, ATC, VTS, and portable search-and-rescue applications. The product portfolio spans the RT-600 airborne family, RT-500-M marine, RT-400 portable, RT-1000/RT-1000 MC ATC, RT-800 VTS systems, plus complementary software (smartDF, DF Scout, DF Commander MK2). The company operates as the master distributor and factory-authorized service center for RHOTHETA Elektronik GmbH products in the Americas, Australia, New Zealand, China, Japan, and Israel.

Product overview

Rhotheta International is a specialist provider of multi-platform Radio Direction Finding (RDF) and location systems for air, land, and sea applications. The company offers a comprehensive portfolio of Doppler-based direction finders organized across five product categories: Marine (RT-B77, RT-100, RT-202, RT-300, RT-500-M), Airborne (RT-600-A, RT-600-L, RT-600 Light, with smartDF app), VTS (RT-800, RT-1000, RT-1000 MC, DF Commander MK2, 9000-2GM, 9020-2G), Portable (RT-400, DF Scout), and ATC. Software solutions include DF Commander MK2 (remote control and monitoring), smartDF (iPadOS app for RT-600), and DF Scout (Android moving maps app). The product ecosystem shares core Doppler direction finding technology across platforms, with software applications (smartDF, DF Scout) designed to work with specific hardware models. The RT-600 series is the flagship airborne platform with multiple variants (A for SAR, L for law enforcement, Light for drones), while RT-500-M serves marine SAR and RT-400 serves portable/land applications. The company leverages 30+ years of engineering experience building products for professional SAR organizations, ATC, VTS, and law enforcement agencies.

Differentiator

Problem solved

Functional benefit

Brands

• smartDF: iPadOS application designed as a display control unit (DCU) for the RT-600 Antenna, allowing tablets to control and display direction finding data.
• DF Scout
• DF Commander MK2

Products and services

• RT-600-A Advanced Doppler wideband VHF-UHF radio direction finder for airborne SAR applications, covering 118-470 MHz including Air AM, Marine FM, UHF AM, UHF FM, and Cospas-Sarsat 406 MHz beacon decoding. Used in helicopters and fixed-wing aircraft for SAR and maritime surveillance missions.
• RT-600-L Advanced Doppler wideband VHF-UHF radio direction finder for combined SAR and law enforcement/public safety applications. Includes all RT-600-A features plus LoJack, ETS, and medical beacon capabilities. Used by US police helicopter units and similar law enforcement aviation programs.
• RT-600 Light Lighter-weight version of the RT-600 antenna unit (2.85 lb) designed for drone mounting applications, providing rescuers with height and range advantages for improved line-of-sight and search coverage. Used in UAV-based SAR and maritime patrol missions (e.g., Hermes 900 with Elbit Systems).
• RT-500-M Marine V-UHF radio direction finder system for professional ship-borne SAR applications. Operates within 118-470 MHz including all international emergency frequencies. Features advanced connectivity for ECDIS, Gyrocompass, and GPS, and is used by US Coast Guard, Canadian Coast Guard, and other national fleets.
• RT-400 Portable multi-band radio direction finder for SAR, law enforcement, and radio interference pinpointing. Supports manpack and vehicle configurations with wireless antenna-to-tablet communication for displaying and saving bearing lines on moving maps. Used by ground teams and airport emergency response (e.g., DGAC Paris).
• RT-1000 2-channel Voice Direction Finder (VDF) system for ATC and VTS applications, complying with ICAO and Deutsche Flugsicherung requirements. Marketed by Rohde & Schwarz as the PA030; deployed in over 100 systems worldwide.
• RT-1000 MC Multichannel VDF system for ATC and VTS applications covering up to 24 simultaneously DF channels. Built on RT-1000 A and C Doppler direction finders, offering a best price-performance ratio for larger airports.
• RT-800 Direction finder system for Vessel Traffic Services (VTS) applications, designed for remote-controlled operation in networked configurations often used for multi-site triangulation.
• RT-300 Cost-effective radio direction finder covering VHF marine and aviation bands for homing on activated emergency beacons including EPIRBs, PLBs, and man overboard beacons. Can be controlled via NMEA interface for system integration.
• RT-202 Fourth generation CrewFinder automatic direction finder for use in high sea states, developed from the RT-200 with enhanced functionality. Used by maritime rescue organizations worldwide.
• RT-B77 Direction finder product in the Marine product line for maritime applications.
• RT-100 (CrewGuard) Emergency receiver (also known as CrewGuard) for monitoring the international emergency frequency 121.500 MHz and triggering alarms in the event of an incident.
• 9000-2GM VTS direction finder product for vessel traffic services and coastal monitoring applications.
• 9020-2G VTS direction finder product for vessel traffic services and coastal monitoring applications.
• smartDF iPadOS application for remote monitoring and control of the RT-600 airborne DF over Bluetooth Low Energy. Uses iPad GPS/GNSS, compass, and accelerometer sensors to display DF information over maps.
• DF Scout Android-based moving-maps application for wireless communication with the RT-400 and RT-600 Light. Displays DF signal data on maps with intuitive GUI, supports Cospas-Sarsat decoding, live bearing, and automated triangulation.
• DF Commander MK2 Direction Finder Remote Control and Monitoring Software for controlling and displaying DF bearing information. Includes bearing beam (LOB) and cross-bearing display on OpenSeamap reference maps, used with RT-1000/RT-1000 MC and VTS systems.
• RT-600 Mission Simulator Mission simulator for the RT-600 airborne DF system, used for operator training.
• RT-8656 Ramptester Training and test equipment for the RT-600 airborne series.
• RT-14400WP Training and test equipment for the marine direction finder product line.
• RT-8556 Ramptester Training and test equipment for the marine direction finder product line.

Quantifiable outcome

• 117 lives saved by Civil Air Patrol in 2019 alone with RT-600 equipped aircraft
• +4 more outcomes

Named customers16 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration7 records

Feature6 records

Partnerships

Eleven partnerships are on record, tiered core and minor.

• TimeZero (Maxsel)coreTechnology or Integration · 18 September 2023TimeZero Coastal Monitoring software achieved full compatibility with Rhotheta RT-300, RT-500-M, and RT-800 RDF systems. Enables real-time RDF display over nautical charts with automatic distress beacon alarm triggering.
• Hart Marine Pty LtdminorChannel Partner/ Reseller/ Distributor · 1 January 2021Victorian company awarded tender for Tasmania Police $3.2 million patrol vessel equipped with RT-500-M.
• L3 HarriscoreTechnology or Integration · 1 January 2019Main contractor for US Coast Guard Sentinel-class FRC program. Rhotheta supplies RT-500-M for integration into mission systems on new cutters. Deliveries ongoing since 2019.
• Seacoast Marine ElectronicscoreChannel Partner/ Reseller/ Distributor · 1 January 2019Dealer based in Halifax, Nova Scotia with offices in Maple Ridge BC and St Catharines ON. Awarded Canadian Coast Guard contract for RT-500-M supply and installation.
• Elbit SystemscoreTechnology or Integration · 1 January 2019Hermes 900 maritime patrol UAS integrated with Rhotheta RT-600 for Icelandic maritime authorities. Contract via EMSA.
• Rohde & SchwarzcoreChannel Partner/ Reseller/ Distributor · 1 January 1994Markets RT-1000 as PA030 designation. Partnership established in 1994 for ATC/VTS direction finder distribution.
• Becker Flugfunkwerk GmbHcoreChannel Partner/ Reseller/ Distributor · 1 January 1989Historical distribution partner for RT-1000 and RT-600 SAR-DF 517 designation. Marketing of RT-1000 began in early 1990s.
• CNC TechnologiescoreImplementation/ SI/ Consulting PartnerAviation technology and wireless communications company that develops mission systems integrating Rhotheta RT-600 for Texas DPS and other law enforcement customers.
• Metro AviationcoreImplementation/ SI/ Consulting PartnerAircraft completion center that installs Rhotheta RT-600 in helicopters for government customers including Texas DPS H125 delivery.
• Wysong Enterprises Inc.coreImplementation/ SI/ Consulting PartnerFull-service helicopter facility providing completions, customization, refurbishment, and maintenance. Completed Bell 407GXi with RT-600 for Clayton County Police.
• DGzRS (Deutsche Gesellschaft zur Rettung Schiffbrüchiger)coreStrategic or Co-development PartnerGermany's leading SAR organization. Chose RT-200 in 1996 and provided specification for RT-500-M development. Ongoing development partnership for marine SAR equipment.

Scale indicators9 records

Recent moves9 records

Expansion highlights6 records

Broad incumbents

• Rohde & Schwarz: German T&M and radiocommunications major that markets Rhotheta's RT-1000 as the PA030 and also sells its own direction-finding and spectrum-monitoring products. Overlaps with Rhotheta in ATC/VTS radar and radiomonitoring, with a much broader portfolio of broadcast, T&M, and security products.
• L3Harris Technologies: US defense prime and Rhotheta's partner as the main contractor on the USCG Sentinel-class FRC program. Sells its own DF, COMINT, and signal-intelligence products and competes with Rhotheta when customers procure turnkey mission systems instead of standalone DF subsystems.
• Thales: Global French defense and aerospace electronics prime with radio direction finding, naval situational awareness, and SAR mission-system offerings. Competes with Rhotheta in maritime SAR electronics and airborne DF subsystems, typically bundled into larger mission-system contracts.
• Elbit Systems: Israeli defense electronics company and Rhotheta's integration partner on Hermes 900 maritime patrol UAS for the Icelandic maritime authorities (via EMSA). Competes with Rhotheta in unmanned airborne DF sensor offerings and broader C4ISR mission suites.
• Saab: Swedish defense and aerospace company with airborne surveillance (e.g., SAROPS), maritime traffic management, and electronic-warfare/DF offerings. Competes with Rhotheta for SAR and EEZ-monitoring DF contracts, especially on fixed-wing maritime patrol platforms.
• Leonardo: Italian defense and aerospace prime with naval electronic surveillance, COMINT/DF, and airborne sensor portfolios. Competes with Rhotheta for naval and airborne DF opportunities, especially within NATO and EU defense customers and integrated helicopter avionics offerings.
• HENSOLDT: German defense electronics company formed from Airbus Defence electronics and Kelvin Hughes, with strong positions in naval radar, IFF, and direction-finding subsystems. Competes with Rhotheta on integrated maritime/airborne DF electronics, but as part of a much larger sensor portfolio.

Direct peers

• Narda Safety Test Solutions: Specialist in EMF safety and RF measurement equipment with direction-finding and spectrum-monitoring products comparable to Rhotheta's fixed and portable DF lines. Serves regulatory, telecom, and homeland security customers with similar RF measurement technology, though focused more on test/measurement than airborne SAR.
• TCI (Technology for Communications International): US-based designer and manufacturer of radio direction finding, signal intelligence, and spectrum-monitoring systems for ATC, military, and SAR markets. The closest direct competitor to Rhotheta — both companies sell Doppler-based DF hardware and software to government customers for SAR, COMINT, and ATC applications.
• Indra Sistemas: Spanish IT and defense technology company with a portfolio of radio direction finding and electronic-defense products for ATC and military customers. A direct specialist peer to Rhotheta across homeland security and SAR/military DF applications, with broader geographic reach.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/Rhotheta
• Xx.com/rhothetainc

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Rhotheta International