Found this, it may help :
Spiderbox 9000HD Beginners Set-up Guide
Press the menu button.
Select the Installation section by scrolling right/left
Go to motor setup, press OK
Enter pin code "0000"
Press the green button to allow you to enter your longitude and latitude.
Longitude is switched between E & W by pressing the < and > buttons.
Enter your longitude by using the number keys. Note: if your Longitude is 1.5W (for example) you must enter 001.5W in this field.
Enter your latitude, e,g, 55.6N. You can change N to S with the arrow keys too, but most of you won't want to do that.
Scroll down to save and press OK.
(Therefore, in your case, I'd try entering 000.5W)