print(const char) doesn't know that your const char is in PROGMEM
use the PROGMEM version of print() by casting the parameter to __FlashStringHelper used by F() macro
Thanks for the reply.
Where is __FlashStringHelper used by F() macro documented?
nowhere. it was meant to be a hidden helper. but in case where you don't want to use F() macro but a global PROGMEM string with Print class progmem functions, it is useful to know.