Greg, I compared a APM1 with OSD and Ublox 5 vs a APM2 with MTK and then a Ublox 5 (connected to UART1 (no connections to SPI)
I wrote Remzibi OSD code so messages are sent in text format to Remzibi on UART3 (TM port and connect TM to UART0 (USB) on APM1 with OilPan
I have not yet tried on OSD APM2, I am not sure I can access required pins to connect TM to Port0 (USB)
I also have some MinimumOSD's and will try them first on APM2
Right now the code won't compile as I have modifications to AP_GPS and Mavlink Library for Ublox sending NAV_DOP to get a better idea of the quality of gps fix.
I use a 7.2v lipo battery for OSD power, it has runs for days without issue. but a 3 cell battery will cook OSD over time.
It can be powerd with a Castle Creations BEC programmed for ~ 7.0v to eliminate a battery, but you may suffer from a brown out as power is drained by motor and servos.
The U-Center GPS evaluation software and the manual are available for download here:
when ublox gps is plugging apm,at the same time can i connect to u-center?
so i can get .ubx flight data.
do you have any idea?
No, only one or the other, I monitor one with U-center and one with Mission Planner
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