- Introduction to the IARU Maidenhead Grid System
- OpenTopoMap – Topographische Karten aus OpenStreetMap
- Homepage von DK7IO – Naredi kml/kmz datoteke mreže
- More radio amateur grid squares – Numpty’s Progress – lokator mreža 4 grid
- TK5EP QRA locator map – mreža
QSL kartice:
- https://www.eqsl.cc/qslcard
- ARRL’s Logbook of The World
- HRDLOG.net
- QSL.net
- – QRZ.SI
- Callsign Database – QRZ.com