Grid Locator Calculator vs RUMlogNG2Go
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Grid Locator Calculator
This app helps Amateur Radio operators quickly find their Maidenhead Grid Locator reference using their iPhone's GPS. It works offline and provides 10-digit locators, which can be truncated to 4 or 6 digits as needed. Ideal for portable operations in unfamiliar locations.
- Calculates 10-digit grid locators
- Uses iPhone GPS
- Offline functionality
- Supports 4, 6, and 10-digit locators
- Ideal for portable operations
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For Amateur Radio operators who often travel to unknown places. Forgot to check GL reference? Do not worry. If you have iPhone and GPS is working then you can check your location's GL reference very easily. You do not need internet connection. Ideal if you go to mobile or portable operation often and not sure where GL boundaries are. App shows you 10 digit locator. If you need only 4 or 6 digit, just use first 4 digit or 6 digit, respectively. Note: Usually Grid Locator is 6 digit as defined in ARRL document. This 10 digit is expansion of 6 digit as 7th and 8th are divided by 10 ("0" through "9") then 9th and 10th are divided by 24 ("a" through "x"). This logic is based on article on Wikipedia.
RUMlogNG2Go
This application serves as a contact logging tool for amateur radio enthusiasts. It allows users to manage their QSO logs, import and export data in ADIF format, and integrate with various online services for QSL confirmation and log uploads. Features include DXCC tracking, sunrise/sunset calculations, and DX cluster integration.
- Contact logging for amateur radio
- ADIF file import and export
- DXCC, heading, and distance calculations
- eQSL and LoTW user identification
- Integrated telnet DX cluster
- Real-time Grayline Map
- Transceiver data exchange
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RUMlog is a contact logging tool for amateur radio, very similar and log file compatible to the Mac logger RUMlogNG. * Use the same log file on your Mac computer * 4 user definable logging fields * Exchange the logs via iTunes Filesharing, iCloud or Files * Import ADIF files via email, clipboard, iCloud or Files * Export ADIF files via email, clipboard, iCloud or Files * Log your QSOs up to 3cm * Logging includes DXCC, heading and distance calculations * eQSL and/or LoTW users will be identified during logging * Can save your current position into the Note field, useful for portable or mobile operation * Sunset and sunrise calculations * RUMlog keeps track of your worked and confirmed countries * Direct log upload to eQSL (iPad only) * Direct QSL download from eQSL * Direct QSL download from LoTW * Direct log/QSO upload to Club Log * Integrated telnet DX cluster, including a spot collector * DX cluster command macros * LoTW ans eQSL users are marked in a dx spot * Real Time Grayline Map, showing short and log path to the station * HamQTH.com and qrz.com integration * Basic data exchange with Elecraft, Icom, Kenwood and Yaesu transceivers using the Pigtail hardware (http://pignology.net) or a Bluetooth LE interface (iPad and few TRX only) * Full control panel for Elecraft K3, KX3 and KX2 (iPad only) * Direct IC-705 control over Bluetooth LE for iPad and iPhone * Work RTTY, PSK and CW using the Elecraft transceivers built in functions (iPad only) * DXCC table with counter (including Deleted DXCCs)
Screenshots
Verdict
The clearest difference is price: Grid Locator Calculator at Free against RUMlogNG2Go's $4.99. Grid Locator Calculator also leads on review sentiment (100% vs 74%) and iOS requirement (10.0 vs 17.6). RUMlogNG2Go's advantage is update cadence (every 4 weeks vs every 4 months). On 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
Grid Locator Calculator is free to download; RUMlogNG2Go costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Grid Locator Calculator ships an update every 4 months, RUMlogNG2Go every 4 weeks. The most recent releases landed on October 22, 2026 and November 1, 2026 respectively.
| Parameter | Grid Locator Calculator | RUMlogNG2Go |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | — | 4.7 (253 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 73.5% of reviews |
| Number of ratings | — | 253 — better |
| Update frequency | Every 4 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 22 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Kazunori Watanabe | Thomas Lindner, DL2RUM |
Customer experience
Grid Locator Calculator
RUMlogNG2Go
Bugs and requests
Grid Locator Calculator
Not enough reviews yet to summarise bugs or requests.
RUMlogNG2Go
Reported bugs
17 issues- Date and time (UTC) fields not functioning properly
- eQSL not working, incorrect password message
- DX-CLUSTER without function, no response from Sysop
- Will not download ADIF logs from onecloud
- Local Time and UTC mixed, data converted to UTC
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- Date display removed in recent updates
- App crashes permanently (initially)
- Logbook will not download ADIF logs
- Cannot transfer log from iPad to QRZ.com
- Cannot search logbook by other criteria
- Does not flash up first name when adding call sign
- Sync with RumLog NG on Mac requires copy-paste
- ADIF import difficult, requires file type change and copy-paste
- ADIF export option not available
- Import from Dropbox does not import ADIF
- Map not zoomable
- Stopped working after update
Requested features
12 requests- Add K4D as rig option for TRX Control
- Add AMP KPA1500
- Add RT21-D Rotor Control
- Search logbook by first name or town
- Flash first name when adding call sign
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- Auto-populate name and locator from QRZ
- Pileup mode for iPad
- Sync with RumLog NG on Mac without copy-paste
- Integration with Hamlog.online
- Export to iCloud Drive and/or MS OneDrive
- Generic file import using file extension
- Make map zoomable
In-app purchases
Grid Locator Calculator
No in-app purchases
RUMlogNG2Go
No in-app purchases
Questions
Is Grid Locator Calculator free?
Is RUMlogNG2Go free?
Do Grid Locator Calculator or RUMlogNG2Go have ads?
Which is updated more often, Grid Locator Calculator or RUMlogNG2Go?
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