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@yalaniv,

Take a look at this topic:

Unexpected Character Movement

I am developing a sketch to graphically display GPS data coming from an Arduino. The sketch paints the background and “gauge” bezel and then calls various functions to fill in the face with appropriate data, . The compass function paint dots for 5 degree gradations in a circle inside the bezel. Following the dots the directional characters are displayed in a circle around the dots. Finally a pointer is painted. The first time through the function, all is well. The second time through the fun…

It will help you get to this:

:)