looping on mysql query - php

Question

im busy with a script to load mysql data in php variablen.
My database is an gps tracking database with different users and gps coordinates in a table.
The problem is. each gps update has its own ID... for an example if userA posting his gps location that will be id 1, but when user B also post their location 5 minutes later this is id 2, when userA post their location again 10 minutes later, that will be id 3.
Now is the question. How can i sort the newest gps locations for each user.
This is my table structure and my code:
//Tabel selecteren en wat opties defineren
$posities = mysqli_query($raw,"SELECT * FROM positions INNER JOIN devices ON positions.device_id = devices.id ORDER BY positions.id DESC");
//Aantal gebruikers tellen in de devices tabel aanroepen via $aantalgb
$query = mysqli_query($raw,"SELECT COUNT(id) FROM devices");
$row = mysqli_fetch_row($query);
$aantalgb = $row[0];
mysqli_free_result($query);
echo "<table border='1'>
<tr>
<th>ID</th>
<th>Naam</th>
<th>Tijd</th>
<th>Lat</th>
<th>Lon</th>
<th>Snelheid</th>
</tr>";
while($pos = mysqli_fetch_array($posities)) {
echo "<tr>";
echo "<td>" . $pos['device_id'] . "</td>";
echo "<td>" . $pos['name'] . "</td>";
echo "<td>" . $pos['time'] . "</td>";
echo "<td>" . $pos['latitude'] . "</td>";
echo "<td>" . $pos['longitude'] . "</td>";
echo "<td>" . $pos['speed'] . "</td>";
echo "</tr>";
}
echo "</table>";
Thank you!