sgt_johnny:
Mega is not a option, since my board with all the stuff is already solderedAnd yes, i need a File, to write down gps and data and then read in on computer...
So as the Mega is 'not an option', do you think some other solution will appear as if by magic ?
If your project is using a display, GPS and SD card then runs out of program space big time, you need to accept reality, you need an Arduino such as the Mega (or 1284P) that is 'not an option'
I would also make a suggestion, dont decide on or commit to the hardware design until the software is actually working.