Real-Time Telemetry

DCS World, X-Plane Microsoft Flight Simulator, Prepar3D.

On the Same Computer

1. Start flying in your favourite flight simulator
2. Open Tacview
3. Go to Recording -> Real-Time Telemetry, enter localhost as your address, and Connect.

   

   You should start seeing your flight in Tacview immediately

On Two Different Local Computers

1. Start flying in your favorite simulator on Computer # 1.
2. Make sure you know the Local IP Address of this computer – open a command prompt and type ipconfig to find it.

   

3. Open Tacview on computer #2
4. Go to Recording -> Real-Time Telemetry, enter the Local IP Address of computer #1 and click Connect.

   

On Two Computers on Different Networks

1. Make sure the port you will be using (default port is 42674) is open/redirected on your firewall.
2. The host must advise the client of the host's public IP address and Tacview Host Telemetry Password if applicable. Leave password field blank if no password is desired.

   

3. The host starts flying in their favourite simulator
4. The client opens Tacview and goes to Recording -> Real-Time Telemetry, enters the Public IP Address of the host, along with port and password as applicable, and clicks Connect.

   

Falcon BMS

Falcon BMS 4.37.4 & later

First, in the file User\Config\Falcon BMS User.cfg, enter the following lines: set g_bTacviewRealTime 1. See the screenshot for more options.

Launch a flight in Falcon BMS and click F to begin recording.

In Tacview, go to Recording → Real-Time Telemetry (NOT Falcon 4 Real Time Telemetry) and click Start Recording.

Keep in mind that fog of war applies to the real-time telemetry and the generated ACMI files whenever g_bTacviewRealTime is set to 1, as implemented by the Falcon BMS team.

Legacy

First, in the file User\Config\Falcon BMS User.cfg, enter the following line: set g_bTacviewAcmi 0

Launch a flight in Falcon BMS and click F to begin recording.

In Tacview, go to Recording → Falcon 4 Real-Time Telemetry and click Start Recording

If all objects are grey in Tacview, switch focus to Falcon BMS and F twice more to stop and re-start recording. This should allow colours to be injected.

X-Plane

Check Windows Security → Virus and threat prevention → Protection History to make sure that Windows is not blocking X-Plane from creating a file, which could be preventing Real Time Telemetry from working.

Public Protocol

With Tacview Advanced and above, you can stream telemetry data in real-time using the public protocol described in this documentation.

Troubleshooting

Password Encryption

The password must be a crc64 of the UTF-16 text password (not UTF-8).

The crc64 is well documented on the internet, but here is some c++ source code to calculate it.

For example, for the password L"test" the corresponding crc64 will be 0x38e095a027baf2bc

Please note that when Tacview tries to connect to real time telemetry, it uses the official 64-bit CRC hash first for the password. If this fails, it retries with a 32-bit CRC hash. This is because DCS2ACMI is still using 32-bit CRC hash, and Tacview must compensate for that. Anyone writing their own exporter must use 64-bit CRC hash.