wrote:

BTW, we need
2 batteries and 2 varios and 2 GPS's and 2 data loggers, etc to make
everything 100 % reliable. When my wire broke I was 40 miles from home,
switched the Borgelt B-40 to "internal" power and had a vario and audio
to get old JJ back home.

I had a battery die in flight once. I was abouit 100nm from home. No
audio, no GPS. Got back home anyway.

Stefan