I have just purchased this iBal application for the iPhone ($10) and find it quite good. It was not previously available for the B407, so I contacted the company and they agreed to make it available for the 407 if I supplied the needed W&B info. The currently available first release doesnt yet support the 5250 GW or aux fuel options, but this is said to be coming in the next release. If one already has an iPhone, a great deal at $10!
