# GROL Exam Prep & Band Plan — GMDSS, radar, RF calculators > GMDSS, radar, RF calculators (iPhone/iPad app by The Wandering Dev LLC.) - Source: https://appshunter.io/ios/app/grol-exam-prep-and-band-plan/id6809092779 (this page in markdown: same URL + `.md`) - Developer: [The Wandering Dev LLC](https://appshunter.io/developer/883490702) - Category: Reference - Price: Free with in-app purchases (on sale, was $2.99) - Age rating: 4+ - Requires: iOS 26.0 · 5 MB - Languages: American English - Released: 2026-09-08 - Data updated: 2026-10-29 ## What is GROL Exam Prep & Band Plan? Free to start. Works offline. No subscription, no account, no ads, no tracking. GROL Prep is the exam trainer, reference and calculator set a radio operator reaches for at the bench, in the truck, or at sea with no signal — encoded from the current FCC rules and the standard handbook formulas. BAND PLAN • Every US amateur band from 160 meters to 23 centimeters, drawn as a bar you can read at a glance. • Pick Technician, General or Amateur Extra and see exactly where you may transmit, in what modes, at what power — from 47 CFR Part 97, with the section cited on every segment. • Tap any frequency to see who may use it and what convention applies there. • The voluntary ARRL band-plan conventions and calling frequencies, clearly labelled as conventions rather than rules. • Includes the December 2025 changes to 60 meters. FCC EXAM PREP • The complete question pools the FCC publishes for its commercial radio operator examinations: Element 1 (Marine Radio Operator Permit), Element 3 (General Radiotelephone, the GROL), Element 6 (Radiotelegraph), Elements 7 and 7R (GMDSS Operator and Restricted), Element 8 (Ship Radar Endorsement) and Element 9 (GMDSS Maintainer). • 2,859 questions with every figure, reproduced exactly, with each pool's approval date on its page. • Practice exams built the way a COLEM builds the real one: the real length, the real pass mark, one question drawn from each key topic, timed. • Spaced repetition on what you miss, flashcards, and a straight readiness estimate per element. • Element 1, the Marine Radio Operator Permit pool, is free forever. One payment of $14.99 unlocks Elements 3, 6, 7, 7R, 8 and 9. Not a subscription; nothing else to buy. REFERENCE • Q-codes in both question and statement forms, searchable by meaning ("location" finds QTH). • RST signal reports with a decoder: type 579, read what it means. • CW abbreviations and prosigns, with the Morse. • The ITU phonetic alphabet, with a callsign speller: type W1AW/7, read or hear "Whiskey One Alfa Whiskey Stroke Seven". • The three ITU regions and what they mean for a US operator. ANTENNA CALCULATORS • Half-wave dipole, inverted V, quarter-wave vertical with radials, full-wave loop (square, delta or circle) and J-pole. • Frequency in, lengths out in feet-and-inches and metric, with adjustable end-effect constant and wire velocity factor. • Every calculator shows its formula and its assumptions. Cut long and trim. RF MATH • dB to power and voltage ratio and back; dBm to watts and back. • SWR from forward and reflected power; return loss, mismatch loss and reflected power for any SWR. • Coax loss for 15 common lines (RG-58, RG-8X, RG-213, LMR-400, Heliax, ladder line and more) at any frequency and length, with the power reaching the antenna. • ERP and EIRP from transmitter power, feedline loss and antenna gain. SAVED AND EXPORT • Save any calculation with its inputs; bookmark any code, band or abbreviation. Export saved work, bookmarks, exam progress and exam history as CSV or JSON. PRIVATE BY CONSTRUCTION The app has no server of its own and requests no permissions. The only network traffic it can make is the App Store's own, when you buy or restore. Everything you enter stays on your device. GROL Prep is a reference. 47 CFR Part 97 as published by the FCC is the only authority on what you may transmit. The band plan was encoded from the eCFR text on the date shown in Settings, and the FCC changes it from time to time. ARRL is a registered trademark of the American Radio Relay League, Inc., which is not affiliated with and does not endorse this app. The examination question pools are works of the United States Government and are not subject to copyright. Most date from 2009 to 2021 and are nonetheless the pools in force; confirm with your COLEM that no newer pool has been adopted before you sit. Practice exam scores estimate readiness, they do not predict a result. Not affiliated with, endorsed by, or associated with the FCC or any COLEM. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | GROL Exam Prep — All Elements | $14.99 | one-time | ## Is GROL Exam Prep & Band Plan safe? Not enough ratings yet to assess GROL Exam Prep & Band Plan. ## Is GROL Exam Prep & Band Plan legit? GROL Exam Prep & Band Plan appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for GROL Exam Prep & Band Plan is 75 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 3 releases) ### 1.2 — 2026-10-24 The app is now a free download. Everything amateur — the band plan, the reference, the antenna and RF calculators, saved work and bookmarks — is free forever, and so is Element 1, the Marine Radio Operator Permit pool. One payment of $14.99 unlocks the other six FCC commercial pools: Elements 3, 6, 7, 7R, 8 and 9, 2,700 more questions with every figure, their practice exams and their progress. New name and new icon to match, so the app is easier to find for what most people open it for. ### 1.1 — 2026-09-19 FCC exam prep, included in the price you already paid. The complete commercial radio operator question pools — Elements 1, 3, 6, 7, 7R, 8 and 9, 2,859 questions with every figure — with spaced repetition, flashcards, and timed practice exams that mirror the real length and pass mark. There is no in-app purchase; nothing here costs extra. Saved has moved off the tab bar to make room for Exams. It is now the bookmark button at the top of Reference and Calculators, and holds exactly what it did before. ### 1.0 — 2026-09-09 No release notes. ## More apps by The Wandering Dev LLC - [Biblical Hebrew Vocabulary](https://appshunter.io/ios/app/biblical-hebrew-vocabulary/id883490699) - [Biblical Greek Vocabulary.](https://appshunter.io/ios/app/biblical-greek-vocabulary/id904986980) - [PRIZLES](https://appshunter.io/ios/app/prizles/id6760243734) - [Aspect: Nav Rules Drills](https://appshunter.io/ios/app/aspect-nav-rules-drills/id6806712357) - [MiniPrintPal: Print Collector](https://appshunter.io/ios/app/miniprintpal-print-collector/id6817525353) All apps by The Wandering Dev LLC: https://appshunter.io/developer/883490702 ## Related topics [curtis clements](https://appshunter.io/ios/topics/curtis-clements) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-29.*