They have thrusters and "rudders" which are powered by batteries which are charged by solar. The solar will not provide enough power to keep them powering 24/7. Consequently they have to turn them off daily (I think) for a period to allow the batteries to top up. As a result they have periods of down time each day. As for D - IMHO I think D is for Dead. I suspect they could have power issues as it shouldn't have taken this long just to upgrade software. Alternatively there might be some issues with communication. Same result.
KSS Price at posting:
18.5¢ Sentiment: Buy Disclosure: Held
