The sample key will not work
I doubted it would. I requested a key using the "Feedback" form link in the right-hand, bottom of their main display page. [rolleyes2] Also joined the (not too active) Forum. I finally saw the link on the API page... need some new glasses! [banghead]
The easiest 'solution' may be to simply have an 'off-site' link to their site which can include the Lat, Long coordinates; just add:
?35.xxx,-89.xxx,7
(with your own or desired Lat, Long)
The number at the end determines the 'zoom' (3 through 17).