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Reading the map

Everything on the map has a meaning. This is the legend.

Map around Antwerp and Roosendaal with green areas, blue clusters, a green dotted line and an orange dashed line

What you see Meaning
Green area with a number A reference with its real boundary, in your country. The number is the reference, for example ONFF-0602.
Orange outline The area you just tapped.
Dashed ring with an orange dot A reference of your country without a boundary: an approximate spot.
Blue dot A reference in another country.
Blue circle with a number Several blue dots close together. Tap it to zoom in; it splits apart.
Grey line A country border on the base map.

From zoom level 11 every dot gets its reference as a label.

What you see Meaning
Green pulsing antenna icon A station on the air now, with callsign, frequency and mode next to it.
Green dotted line From you to a station that is on the air now.
Faded spot A spot older than 30 minutes.
White dot with an orange ring An announced activation from the agenda.
Orange dashed line From you to an announced activation, labelled with callsign and time.
Your position A marker. When your position is less precise than about 10 m, a dashed ring shows the margin.

Why some references are areas and others dots: Points and areas.