Hi @thibaut, The production of heatmaps necessarily require the long term storage of gaze data which as you probably know is contrary to the Tobii Core SDK licence agreement, so there will be no provided software from this end.
If however, you have an agreement with Tobii to use the Tobii Pro SDK with the C4, then you may have better luck as a number of third party software packages are available online (I saw a few from google) which take a variety of input data such as tracking data, GPS, etc and from there create heatmaps.
Hi @thibaut, there is certainly no issue hardware wise in using the 4C for the creation of heat maps.
The matter is related to the fact that heatmaps necessarily require storage of gaze data which for the Tobii Tracker 4C requires the Pro SDK licence as long term storage of gaze data is prohibited by the standard user licence agreement.
I hope this clear things up, please let me know of any further questions.