Marinus vs GT Orcas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Marinus
This app provides comprehensive guidance on maritime navigation rules and signals. It offers detailed information on flags, lights, sounds, and buoyage systems, along with interactive quizzes and a map feature. Designed for sailors, it ensures safe navigation on any vessel.
- Maritime flags and meanings
- Weather scales and cloud identification
- Sound signal guidance
- Vessel navigation light diagrams
- Day shape identification
- Safe navigation maneuvers
- Morse code decoder
- IALA Buoyage System
- Radio communication guidelines
- COLREGs text
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Not just another app for navigation rules… this is THE app for navigation rules! Created by sailors, for sailors, Marinus COLREGs is designed to provide clear and instant answers to your questions anytime, anywhere. It's the essential app for your sailboat or motorboat. Key Features: • Flags – All maritime flags with their meanings. • Meteo – Beaufort and Douglas scales, plus cloud identification. • Sounds – Navigate safely with sound signal guidance. • Lights – Detailed views of every vessel's navigation lights from all angles. • Day Shapes – Learn and identify the correct day shapes for any situation. • Maneuvers – Clear guidance on safe navigation maneuvers. • Morse – Decode Morse signals with ease. • Buoys (IALA) – Understand the International Buoyage System. • Radio – Key radio communication guidelines. • ColRegs – Full text of the International Regulations for Preventing Collisions at Sea (IRPCS). • Quiz – Test your knowledge with interactive quizzes. • Map – Visualize navigation concepts on an interactive map. Access PRO Features Unlock all PRO features with an affordable annual subscription. Your support helps us maintain and improve the app, keeping it the trusted tool for sailors around the world. Join thousands of sailors who trust Marinus ColRegs every day on their iPhone. Whether you're an experienced seafarer or just starting your nautical journey, this is the app you’ve been looking for! For any questions, feel free to contact us at info@marinus.es.
GT Orcas
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La Coordinadora para o Estudo dos Mamíferos Mariños (CEMMA) es una ONG con ámbito en Galicia fundada en 1992, dedicada al estudio, conservación y divulgación de las tortugas y mamíferos marinos, a través de la investigación, promoviendo y participando en proyectos con instituciones estatales e internacionales y potenciando aspectos divulgativos mediante exposiciones, conferencias y cursos. Esta App ofrece y permite: - Identificar a las principales especies de cetáceos - Disponer de información sobre los avistamientos e interacciones de las orcas - Consultar mapas con las zonas de más actividad de las orcas - Enviar información sobre avistamientos e interacciones de cetáceos - Informar sobre protocolos de seguridad en caso interacción
Screenshots
Verdict
The clearest difference is in-app purchases: GT Orcas at none against Marinus's 1. GT Orcas also leads on ads (none vs shown) and iOS requirement (11.0 vs 13.0). Marinus's advantage is update cadence (every 5 weeks vs every 4 months). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Marinus sells 1 in-app purchase, starting at $8.99 per year. GT Orcas asks for nothing beyond the download.
Marinus ships an update every 5 weeks, GT Orcas every 4 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | Marinus | GT Orcas |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (215 ratings) — better | — |
| Positive reviews | 65.3% of reviews | — |
| Number of ratings | 215 — better | — |
| Update frequency | Every 5 weeks — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 113 MB | 59 MB |
| Age rating | 4+ | 17+ |
| Developer | Alejandro | VANSIA SISTEMAS S.L. |
Bugs and requests
Marinus
Reported bugs
4 issues- App not working, ads won't clear
- App crashes frequently
- Mistake with sounds
- App crashes after 10-15 seconds
Requested features
7 requests- Settings for Buoyage A & B & combined
- Search feature
- Combine sounds and lights
- Add tides information
- More free version functionality
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- More detail in maneuvers section
- Lights with silhouette and head-on/stern-on views
GT Orcas
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Marinus
- Marinus PRO3 Days trial$8.991 Year
GT Orcas
No in-app purchases
