– Amateur Radio Logging Built for the Field –
When I first started developing W4MSI Logger, the goal was fairly simple: create an Amateur Radio logging application that was easy to use during portable operations without leaving out the information and tools operators actually need.
The project originally centered around TOTA – Tiles On The Air, along with a General Log for everyday contacts. Since then, W4MSI Logger has grown considerably through continued development and, just as importantly, actual use in the field.
Today, W4MSI Logger supports POTA – Parks on the Air, TOTA, simultaneous multi-program activations, multi-operator contacts, offline reference databases and maps, GPS Journey Recording, ADIF and GPX export, and a General Log—all within the same application.
The goal, however, has remained the same:
Make logging useful without making it complicated.
Built Around Field Operating
Portable operating already involves enough moving parts. You may be managing a radio, antenna, battery, logging device, activation requirements, weather, and hopefully a steady stream of contacts at the same time.
The logging application should help with that process rather than become another thing that needs constant attention.
W4MSI Logger is built around a straightforward contact-entry workflow with the information needed for normal Amateur Radio logging and supported activation programs. Band, mode, frequency, signal reports, power, station information, program references, and other contact details stay organized without turning every QSO into a lengthy data-entry exercise.
A number of the app’s current features came directly from using it during real activations and identifying small things that could make operating easier.
For example, park and tile references remain visible while logging, and multi-operator contacts can be entered together when several operators share the same exchange. W4MSI Logger still creates a separate QSO for each callsign, but common information such as band, mode, signal reports, POTA parks, or TOTA tiles only needs to be entered once.
POTA and TOTA Support
W4MSI Logger now provides dedicated activation workflows for both Parks on the Air and Tiles On The Air.
For POTA, operators can create single- or multi-park activations, log Park-to-Park contacts, track the running QSO count, search park information, and export activation logs in ADIF format.
An optional offline POTA parks database also allows park searches without an internet connection. When location access is enabled, Find Parks Near Me can display nearby active parks sorted by distance and show them on a map.
The park coordinates are intended as a useful discovery and navigation aid; operators should still verify that their actual operating location meets the applicable POTA activation requirements.
TOTA operators can create activations using a 6-character Maidenhead grid tile, determine or select a tile using GPS or the map, log Tile-to-Tile contacts, and optionally record a GPS Journey during the activation.
Journey Recording can track movement in the background, display whether the operator is inside or outside the target tile, provide tile entry and exit alerts, and export the completed route as a GPX file.
GPS Journey Recording remains completely optional. A TOTA activation can be logged normally without recording a Journey.
TOTA + POTA at the Same Time
One of the more significant additions is the ability to operate TOTA and POTA simultaneously.
This reflects a situation that can easily happen in the field: an operator may be inside a POTA park while also activating a TOTA tile.
Rather than running two separate logging sessions, W4MSI Logger allows both programs to be selected when the activation begins. Contacts are entered through one logging screen, while the application maintains the appropriate POTA and TOTA information behind the scenes.
When the session ends, the two activations remain separate in the activation history and can be reviewed and exported independently.
The underlying multi-program design also gives W4MSI Logger room to support additional Amateur Radio operating programs in the future without requiring an entirely different workflow for every possible combination.
Designed to Work Offline
Reliable internet access cannot be assumed during portable Amateur Radio operations, so offline capability has become an important part of W4MSI Logger.
Core logging does not require an internet connection.
Android users can also optionally download several resources before heading into the field:
- A U.S. Amateur Radio callsign database
- A worldwide POTA parks database
- Offline map packages for supported U.S. regions
The callsign database can provide operator name, state, and Amateur Radio license-class information while logging. The POTA database supports park searching and nearby-park discovery, and downloaded map packages allow supported mapping functions to continue without cellular or Wi-Fi service.
These resources are optional. Operators can choose what they need rather than being required to download large amounts of offline data simply to use the logger.
General Logging, Export, and Backup
W4MSI Logger is not limited to activations.
The built-in General Log provides a straightforward place to record everyday Amateur Radio contacts outside POTA or TOTA and includes contact editing, offline callsign lookup, and ADIF import and export.
Activation logs can also be exported as ADIF, while recorded TOTA Journeys can be exported as GPX. Files can either be saved directly to the device or shared through Android’s normal sharing options.
I have used W4MSI Logger during real TOTA and POTA activations and successfully submitted the resulting logs and Journey data to the respective services. That real-world testing has been an important part of refining both the logging workflow and the export formats.
The app also includes Backup & Restore for protecting information that would be difficult to recreate, including settings, activations, QSOs, General Log contacts, and Journey data.
Downloaded databases and map packages are not included in backups because those resources can simply be downloaded again.
Local-First and Privacy-Focused
W4MSI Logger does not require a W4MSI account, and there are no third-party advertisements.
Logs, activations, settings, and Journey information are primarily stored locally on the operator’s device. W4MSI Logger does not operate a central cloud service for storing your Amateur Radio logs.
That local-first approach fits naturally with the app’s focus on field operation and offline use.
Developed Through Real-World Use
W4MSI Logger has changed quite a bit from the original TOTA-focused concept, but I do not want it to lose the simplicity that motivated the project in the first place.
New features are useful only if they make operating easier.
Several of the improvements now in the app—including simultaneous TOTA and POTA sessions, multi-operator logging, nearby park discovery, persistent park and tile information, linked contacts, and improved export handling—came directly from taking the application into the field and using it while actually operating.
That will continue to be the direction of the project.
Amateur Radio Logging For The Field.
Learn More About W4MSI Logger
A complete overview of W4MSI Logger, including current features, screenshots, offline capabilities, and availability information, can be found on the official product page:
Visit the W4MSI Logger Product Page
The current Android release is W4MSI Logger Version 1.7.9.
W4MSI Logger is an independent application and is not affiliated with or endorsed by Tiles On The Air (TOTA) or Parks on the Air (POTA).
I’m looking forward to continuing development—and especially to seeing how other operators put W4MSI Logger to use in the field.
73,
W4MSI
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