Maiana True HDG & Mag COG are missing/null

[volksbar]

Hello,

I would like to use the radar overlay function, which requires either the true heading or mag COG. As far as I understand, Maiana is supposed to provide both data. 

However, in SignalK, I could tell:
both Maiana's navigation.courseOverGroundMagnetic and navigation.magneticVariation are null.

Using the debug mode of openplotter, I got the following information:

Code:

pi@openplotter:~ $ openplotter-maiana

(openplotter-maiana:6128): Gtk-CRITICAL **: 20:07:19.726: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar

(openplotter-maiana:6128): Gtk-CRITICAL **: 20:07:19.904: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar

Does anyone know how to proceed with the trouble shooting? Is it a hardware issue or was my setting wrong?
Many thanks!

[holgerw]

you only get correct position data from an single gps if this is moving.