git ssb

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var GreatCircle = require('great-circle')
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var pre = document.createElement('pre')
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document.body.appendChild(pre)
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function flatten (p) {
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  var o = {}
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  for(var k in p)
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    if(p[k] && 'object' === typeof p[k])
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      o[k] = flatten(p[k])
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    else
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      o[k] = p[k]
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  return o
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}
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var positions = []
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pre.textContent = 'waiting for position...'
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navigator.geolocation.watchPosition(function (e) {
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  console.log(e.coords, e.timestamp)
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  positions.push(flatten(e))
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  //keep just one minute's worth of locations.
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  if(e.timestamp < Date.now() - 60e3) // one minute
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    positions.shift()
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  var lat = e.coords.latitude, log = e.coords.longitude
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  var movement = positions.map(function (_e) {
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    var _lat = _e.coords.latitude, _long = _e.coords.longitude
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    return {
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      distance: GreatCircle.distance(_lat, _long, lat, long, 'NM'),
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      heading: GreatCircle.bearing(_lat, _long, lat, long)
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    }
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  })
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  pre.textContent = JSON.stringify({current: flatten(e), movement: movement}, null, 2)
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})
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