Using Geolocation within Google Places API - google-places-api

Question

I'm simply trying to replace the lat long coords to use the browsers geolocation yet I'm getting no result...
Code for the geolocation is;
<script> var coords = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
function initAutocomplete() {
var map = new google.maps.Map(document.getElementById('map'), {
center: coords,
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
The rest of the code points to the simple places api service;
// Create the search box and link it to the UI element.
var input = document.getElementById('pac-input');
var searchBox = new google.maps.places.SearchBox(input);
map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);
// Bias the SearchBox results towards current map's viewport.
map.addListener('bounds_changed', function() {
searchBox.setBounds(map.getBounds());
});
var markers = [];
// Listen for the event fired when the user selects a prediction and retrieve
// more details for that place.
searchBox.addListener('places_changed', function() {
var places = searchBox.getPlaces();
if (places.length == 0) {
return;
}
// Clear out the old markers.
markers.forEach(function(marker) {
marker.setMap(null);
});
markers = [];
// Create a marker for each place.
markers.push(new google.maps.Marker({
map: map,
icon: icon,
title: place.name,
position: place.geometry.location
}));
if (place.geometry.viewport) {
// Only geocodes have viewport.
bounds.union(place.geometry.viewport);
} else {
bounds.extend(place.geometry.location);
}
});
map.fitBounds(bounds);
});
}
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(success);
} else {
error('Geo Location is not supported');
}
</script>
I cannot for the life of me find any reliable tutorials on-line...