Came across this post on the Mikrokopter forum and wondered how this might affect the Ardupilot fitted with the Ublox LEA5-H: " we did our tests with the LEA5H to use it with the NaviCtrl. We couldn't find a solution to get it work. The data rate of the LEA5 is not constant. (depends on how many satelites are received). Statement from ublox: this is a typical behavior, if you use refresh rates below 1 Hz.
This is the reason, why we use the LEA4H for our MKGPS.
So - LEA5H is not recommended to use together with the NaviCtrl."
The NaviCtrl is an ARM based navigation/data logging board with GPS.