Step 1
Log in with your LoTW account
Your credentials are used to download your own report from the ARRL. Gridmaster never posts anything to your logbook — it only reads.
VUCC · Satellite · EME · Rovers
Visualize your QSOs on the globe
Gridmaster maps every Maidenhead grid you have worked — satellite, VHF, UHF, SHF and EME. See which grids are still missing, prepare your next roving trip and follow your awards in real time.
- Automatic LoTW import
- No software to install
- Always free
1 789 939QSOs mapped
2 260Operators
2 696 110Grids tracked
403Rovers
Three clicks from your LoTW log to a world map
Gridmaster reads the ADIF report that Logbook of the World generates for you, keeps only what matters for grid hunting, and draws it. No client, no plugin, nothing to install on your computer.
Step 2
Only the useful lines are kept
Satellite QSOs and every VUCC band (4 m to 23 cm) are recognised, grids extracted, duplicates dropped — tens of thousands of QSOs per import.
Step 3
Explore your grid map
Zoom on any grid, list what is confirmed, spot what is needed and check your award score whenever you want.
Built for grid hunters and satellite rovers
Whether you chase VUCC on 2 m, collect rare grids on a linear satellite, or drive from grid to grid on a weekend, Gridmaster keeps the score for you.
- Confirmed vs worked — LoTW-confirmed contacts and paper QSLs are counted separately, never mixed.
- Multi-grid QSOs — a rover contact spanning several grids counts for every grid of the exchange.
- Rover ranking — activations are ranked, so you know which grids deserve a trip.
- Nothing to install — the map runs in your browser, phone included.
Frequently asked
Everything an operator usually asks before importing a logbook.
Is Gridmaster really free?
Yes. The site is free, without ads inside the map, and funded by its author and by Demarcq.net hosting.
Does Gridmaster modify my LoTW logbook?
No. Your LoTW credentials are only used to download the ADIF report that the ARRL generates for you. Nothing is uploaded or written back to Logbook of the World.
Which bands and awards are covered?
Satellite QSOs, EME, and the VUCC bands from 4 m to 13 cm — 4 m, 8 m, 6 m, 2 m, 1.25 m, 70 cm, 23 cm and 13 cm — plus DXCC, WAZ and WAS tables and the rover ranking.
Do I need to install anything?
No. Gridmaster runs in the browser, on a computer or a phone. The only requirement is a LoTW account.
Your grids are already waiting in your LoTW log
Automatic import, instant map, free account — and your logbook is never modified.
