W4MSI Logger - Amateur Radio Logging for the Field
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Built for operators

Amateur Radio logging that stays out of your way.

W4MSI Logger is a field-focused Amateur Radio logging app for everyday contacts and portable activations, with dedicated TOTA support, optional GPS Journey Recording, mapping, and standards-based exports.

  • General Amateur Radio log
  • TOTA activation logging
  • Optional background GPS Journey Recording
  • Inside / Outside target tile status
  • ADIF export
  • GPX Journey export
  • Local data storage
  • No account or advertising
W4MSI Logger radio tower logo
Core features

Everything needed for field logging.

LOG

General Log

Log callsigns, operator information, power, band, mode, frequency, reports, grid information, and timestamps without creating an activation.

TOTA

TOTA Activations

Create Tiles On The Air activations using 6-character Maidenhead tiles, capture Tile-to-Tile contacts, and maintain a complete activation history.

GPS

Journey Recording

Optionally record your GPS journey while operating. Tracking can continue while the screen is locked or another app is in use.

MAP

Tile Mapping

Select a TOTA tile from the map and see current position, recorded route, and Inside / Outside status during an active Journey.

ADIF

ADIF Export

Export contacts using the standard Amateur Data Interchange Format for import into compatible logging applications and services.

GPX

GPX Export

Export recorded Journey data in GPX format for viewing, archiving, or use with compatible GPS and mapping software.

Inside the app

A clean interface designed for actual operating.

From starting an activation to recording contacts and reviewing a journey, the workflow is designed to remain clear and usable on a phone in the field.

W4MSI Logger home screen
W4MSI Logger new activation screen
W4MSI Logger TOTA tile map
W4MSI Logger Journey Recording screen
W4MSI Logger General Log screen
Portable by design

Core logging works where the internet doesn't.

W4MSI Logger keeps its core logging and activation functions local to the device. You can continue logging contacts and managing activations when cellular or Wi-Fi service is unavailable.

Mapping features may require an internet connection, while previously loaded map data may remain available from cache.

✓
Your data stays under your control.No account is required. Logs, activations, settings, and Journey information are primarily stored locally. W4MSI Logger contains no advertising and does not operate a central cloud service for storing your Amateur Radio logs.

Recorded QSO information can include

  • Contact and operator callsigns
  • Band, mode, and operating frequency
  • RST sent and received
  • Transmit power
  • Local and UTC timestamps
  • Activation and TOTA tile information
  • Tile-to-Tile information
Developed by an operator

Built by W4MSI.

W4MSI Logger is developed by Dustin Smith – W4MSI with an emphasis on practical Amateur Radio field operation. Additional activation programs and tools are planned for future updates.

View the W4MSI Logger Privacy Policy

W4MSI Logger for Android

Amateur Radio logging for the field.

Get it on Google Play
Google Play availability may vary while the app progresses through testing and release stages.
W4MSI Logger • Amateur Radio logging for the field • Developed by W4MSI