1 degree = 60 minutes
1 minute = 60 seconds
17 is already in degrees, so we have to take a look at 0.47
You should just multiply 0.47 by 60 to get the minutes, and that is 28.2
Now, we should multiply 0.2 by 60 to get the seconds, and that is 12.
So, 17.47° converted to degrees, minutes, and seconds is 17º 28' 12"
