I believe it rests under its own weight and friction. In an interview, Musk said the acceptable wave height was 2-3 times higher than the ones seen during that landing.
It still has surplus horizontal velocity when it hits the deck, hence the sliding. [1] Musk confirmed on Twitter that the rocket in fact doesn't need securing and the metal shoe plan turned out to be unnecessary.
I have Google cardboard too - but usually that has two views right?
How did you get this to work? Still impressive just looking 'up' with the bare phone!
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[ 2.8 ms ] story [ 42.8 ms ] thread[1]: https://twitter.com/elonmusk/status/726218218109444096
http://spaceflight101.com/spacerockets/falcon-9-v1-1-f9r/
https://twitter.com/elonmusk/status/726218218109444096
For CRS-8 they used jacks and chained it hooks welded on the deck. Done by humans, not remotely.
https://i.imgur.com/NAJU4JS.jpg
https://i.imgur.com/IBZmewR.jpg
Not sure if they'll keep doing this, given Musk's tweet saying it doesn't need securing. https://twitter.com/elonmusk/status/726218218109444096
https://www.youtube.com/watch?v=KDK5TF2BOhQ
I liked hearing the audio too: the hum of the barge, the double-crack of the sonic boom followed by the roar of the engines. Epic!
Hopefully in the near future there will be landings shot in higher resolution, and with better audio.