Some readouts are hard coded in the Chart View. I think all the rectangular display models are that way. I know the 800 and 900 series are since they have the left side readouts. All the Helix models have the left side readouts too.
Since the Helix has the overlay features setting to turn off the left side readouts, those readouts are hard coded according to the view you select. Evidently Humminbird choose direction to be more important when using the Chart view than temp is.
The 1100 series has bottom readouts that are more customizable since there are two groups of settings. BUT the 1100 series does not have readout overlays like the Helix models.
Bottom line is if you want temp displayed in the Chart view, turn the left side readouts on and choose what box to display it.
Edited by Wayne P. (01/19/16 01:22 PM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1