How do I get signalk data into node red

[e-sailing]

Can anyone help me with the correct function to change this value to celcius (sustract 273.15). Is this done in Node-RED or earlier in openplotter/signalK

Import this function "Convert" for: m/s to kn, rad to deg, K to C

Code:

[{"id":"6798b965.b393e8","type":"function","z":"ad773e6c.c040d","name":"convert","func":"var numInput = Number(msg.payload);\n//convert m/s to kn\n//msg.payload = Math.round(numInput*19.43844492)/10;\n//convert rad to deg\n//msg.payload = Math.round(numInput*572.95779513)/10;\n//convert K to C\nmsg.payload = numInput-273.15;\nreturn msg;","outputs":1,"noerr":0,"x":192.49998474121094,"y":651.3999938964844,"wires":[[]]}]

[Tocher]

Thanks a lot! Works like a charm

Import this function "Convert" for: m/s to kn, rad to deg, K to C

Code:

[{"id":"6798b965.b393e8","type":"function","z":"ad773e6c.c040d","name":"convert","func":"var numInput = Number(msg.payload);\n//convert m/s to kn\n//msg.payload = Math.round(numInput*19.43844492)/10;\n//convert rad to deg\n//msg.payload = Math.round(numInput*572.95779513)/10;\n//convert K to C\nmsg.payload = numInput-273.15;\nreturn msg;","outputs":1,"noerr":0,"x":192.49998474121094,"y":651.3999938964844,"wires":[[]]}]

[dione]

Thanks a lot! Works like a charm

Import this function "Convert" for: m/s to kn, rad to deg, K to C

Code:

[{"id":"6798b965.b393e8","type":"function","z":"ad773e6c.c040d","name":"convert","func":"var numInput = Number(msg.payload);\n//convert m/s to kn\n//msg.payload = Math.round(numInput*19.43844492)/10;\n//convert rad to deg\n//msg.payload = Math.round(numInput*572.95779513)/10;\n//convert K to C\nmsg.payload = numInput-273.15;\nreturn msg;","outputs":1,"noerr":0,"x":192.49998474121094,"y":651.3999938964844,"wires":[[]]}]

I already got it !!!
I can see the data of my DB sensors in the graphs.
I want to switch from Kelvin to Celsius, but I do not know where to write the code.
Where do I write the code?

Saludos,

[e-sailing]

On node-red webside
right corner three stripes (menu)
import -> clipboard
A window "Import nodes" will open
paste the code

You will get a function block "convert"

[dione]

On node-red webside
right corner three stripes (menu)
import -> clipboard
A window "Import nodes" will open
paste the code

You will get a function block "convert"

Thanks a lot. 
It is running in Celsius.

Saludos,