I use 2.1 pre and GPS works now fine! Many thanks to Eosbandi!!
Now I build a sencond copter also with ATMEGA2560 an something is not clear to me:
On Mega2560 I can connect the GPS Module directly to the free serial port - that works.
But when the I2C-Serial solution with 328p makes some own calculations that would mean for me, that the Main Mega2560 has less to calculate. So my question: Do I have any advantages if I spend a 328p I2C-Serial Board aditionaly to the Mega2560 and use I2C GPS instead of serial-GPS?
Currently I use MTK3329. If we compare MTK3329, MTK3339 (http://shop.trenz-electronic.de/catalog ... th=105_139) and NEO-6M (http://www.rctimer.com/index.php?gOo=go ... oductname=) which one would the best solution for this project? I tend to order the RCTimer module, because the backup battery is an the PCB and the module cost´s only 25USD.
Well, in theory it is more calculations, so using i2cgps with a mega2560 makes sense, however it is not that mutch extra calculation, so using a direcly connected serial gps will eliminate a possible failure point (the extra arduino).
It is not the chip, but the antenna that really counts. MTK3329 with a decent antenna will be in par with a NEO6M, but you will need at least a 25mmx25mm active antenna. I would go for the rctimer module, since you can change the antenna later...
However I changed the small 15x15mm antenna on a PA6B module to 25x25 and it become super sensitive, but to do this you need a decent soldering iron....