Retired Tortoise Mystery Cache

The starting coordinates are false. Work out coordinates from the code to find my retirement home.

RETIRED TORTOISE

Terry the tortoise has had enough
running about, putting the rabbit to shame.
After an shinning career in track and field,
Terry has hung up his running boots and decided to
find himself a nice cosy hidy hole to spend out his days. 
He has hidden himself from the public to rid himself of the constant paparazzi and autograph hunters but if you wish,
feel free to drop in and sign his guest book. 
 

S 420,148 594,1189.74,594,105

E 594,210,105 594,37.594,420,148