Comparison

GMDSS TRAINER vs CA'Sim

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GMDSS TRAINER

Prepare for FCC maritime radio operator exams with this comprehensive study companion. It features official question pools, AI-powered explanations for complex topics, and flexible study modes to help you understand material and pass your certification tests.

Highlights
  • Official FCC question pools
  • AI-powered explanations
  • Multiple study modes (Practice, Exam, Review)
  • Detailed analytics and progress tracking
  • Smart flagging for difficult questions
  • Topic-based performance breakdowns
Features
Read full description

Master Your FCC Maritime Radio Exams with GMDSS TRAINER. Whether you are pursuing a Marine Radio Operator Permit (MROP), the GMDSS Radio Operator's License or a GMDSS Radio Maintainer’s License, GMDSS TRAINER is the modern study companion designed to help you pass on your first attempt. Built for professionals and maritime students, this app combines the official FCC question pools with cutting-edge AI guidance to ensure you don’t just memorize answers—you understand the material. EXCLUSIVE: AI-POWERED EXPLANATIONS Stuck on a complex technical question about signal propagation or distress frequencies? Tap the AI icon to receive a detailed, easy-to-understand explanation generated specifically for that question. It’s like having a maritime electronics instructor in your pocket. COMPREHENSIVE FCC COVERAGE Study for seven FCC Commercial Radio Operator license elements: • Element 1: Marine Radio Operator Permit (MROP) • Element 3: General Radiotelephone Operator License (GROL) • Element 6: Advanced Radiotelegraph Operator's Certificate • Element 7: GMDSS Radio Operating Practices (with Element 1, the full GMDSS Radio Operator's License) • Element 7R: Restricted GMDSS Radio Operator's License • Element 8: Ship RADAR Endorsement • Element 9: GMDSS Radio Maintainer's License NEW: THE FULL ELEMENT 7 POOL All 600 questions from the official FCC Element 7 pool, the exam for the GMDSS Radio Operator's License that deep-sea GMDSS officers hold. Practice by section (DSC, Distress & Safety, Survival Craft & SAR, MSI/NAVTEX, Inmarsat & Iridium, MF-HF and NBDP), or sit a timed 100-question exam with the FCC's 75% pass mark. FLEXIBLE STUDY MODES • Practice Mode: Review questions at your own pace. Use hints to eliminate wrong answers and access AI explanations instantly. • Exam Mode: Simulate the real testing environment with timed sessions and official question counts. See if you can achieve the required 75% passing score under pressure. • Review Mode: Dive deep into your results. Identify weak areas with topic-based performance breakdowns and color-coded answer reviews. KEY FEATURES: • Official Question Pools: every question comes from the published FCC pools for the elements above. • Detailed Analytics: Track your progress over time with intuitive dashboards and performance history. • Smart Flagging: Bookmark difficult questions to review them later. • Topic Breakdown: See exactly which sub-elements you need to study more. • Modern Interface: A clean, responsive design optimized for study efficiency. Don't leave your maritime career to chance. Download GMDSS TRAINER today and take the first step toward your professional FCC certification.

About

CA'Sim

Features
Read full description

Transform your device into a professional radar simulator and collision avoidance training tool. CASim is designed for maritime cadets, deck officers, and navigation enthusiasts who want to master the International Regulations for Preventing Collisions at Sea (COLREGs) through practical application. Bridge the gap between theory and reality. Practice identifying risks on the radar scope, correlating them with visual aspects, and executing the correct maneuvering actions. Key Features: - Realistic Radar Simulator: Experience a fully functional Head-Up radar scope complete with variable range scales, target trails (history), and relative motion vectors. - Tactical Plotting (MoBoard): Integrated digital Maneuvering Board. Plot targets manually or automatically to calculate CPA (Closest Point of Approach), TCPA, and determine the precise course to steer to avoid collisions. - Visual Aspect Visualization: See what the target ship looks like in reality. The app generates 3D models with correct Navigation Lights (Night) and Day Shapes based on the target’s aspect angle. - Restricted Visibility Mode: Simulate fog conditions (Rule 19). Test your ability to navigate using only radar and sound signals. - Sound Signals: Authentic fog signals (Rule 35) are generated automatically based on the vessel type and status (Underway, Stopped, NUC, Anchored, etc.). - Custom Scenarios: Create your own traffic situations with multiple targets, varying speeds, and ship types to challenge your skills. Whether you are preparing for your competency exams or refreshing your skills, CASim provides the most comprehensive simulation environment right in your pocket. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

GMDSS TRAINER4 screens
CA'Sim4 screens

Verdict

The call

The clearest difference is update cadence: CA'Sim at weekly against GMDSS TRAINER's every 4 weeks. CA'Sim also leads on iOS requirement (18.6 vs 26.1). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GMDSS TRAINER sells 1 one-off in-app purchase and CA'Sim sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

GMDSS TRAINER ships an update every 4 weeks, CA'Sim weekly. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 7 level
GMDSS TRAINER versus CA'Sim: the parameters behind the verdict, then further details
ParameterGMDSS TRAINERCA'Sim
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 4 weeksWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS26.118.6 — better
Further details — not scored
Size27 MB6 MB
Age rating4+4+
DeveloperOsprey Applications LLCJatuphol Jaturapat

In-app purchases

1 purchases

GMDSS TRAINER

One-time1
  • Full Access$14.99
4 purchases

CA'Sim

Subscriptions3
  • Unlock All Features. (1 Month)1 Month trial$0.991 Month
  • Unlock All Features. (3 Months)$2.993 Months
  • Unlock All Features. (1 Year)$7.991 Year
One-time1
  • Lifetime Access$17.99

Questions

Is GMDSS TRAINER free?
GMDSS TRAINER is free to download, with in-app purchases available.
Is CA'Sim free?
CA'Sim is free to download, with in-app purchases available.
Do GMDSS TRAINER or CA'Sim have ads?
Neither GMDSS TRAINER nor CA'Sim shows ads.
Which is updated more often, GMDSS TRAINER or CA'Sim?
GMDSS TRAINER ships an update every 4 weeks, and CA'Sim weekly. Most recently, GMDSS TRAINER was updated on October 23, 2026 and CA'Sim on October 11, 2026.

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