@callsign

Call a host who is on the air to start a QSO. Follow the chase with a position report within 5 minutes, and the OTA bot relays your call and grid square to the host.

@<callsign> [message...]

Call a host on the air to start a QSO.

callsign: The host to chase. Any SSID form of their callsign works.
message: Free text relayed to the host along with your grid square. optional

Available to: Anyone, from RF or APRS-IS.
Rate limit: 2 per minute and 5 per 10 minutes

Replies

beacon_prompt: Send a position report within 5 mins to chase {station_call}
de_relay: DE {chaser_call} {grid} {message}
chase_receipt: {station_call} is on the air and you are now chasing
no_beacon_nudge: No beacon received. Send @{base_call} to try again.

Hints

@callsign with no on-air op: {base_call} is not on the air. See aprsota.org/now limited to 1 per hour, then silent
@callsign targeting your own operator: You cannot chase your own op limited to 1 per 24 hours, then silent
repeat @callsign while a chase is already relayed: Already chasing {base_call}. Wait for their QSL. limited to 1 per 24 hours, then silent
beacon with no usable position while a chase awaits one: Beacon has no usable position. Wait for a GPS fix and beacon again limited to 1 per hour, then silent

W1XYZ-5OTA@K7ABC-6 greetings from mike

OTAW1XYZ-5Send a position report within 5 mins to chase K7ABC-6

Your position report must come from the same callsign and SSID that sent the chase. W1XYZ-5 chases, so W1XYZ-5 beacons, not W1XYZ or W1XYZ-9. A beacon from any other station does not satisfy the window. See exchange messages for the whole QSO, step by step, and QSL for how the host confirms it.