erm... im not sure if it only happens to my Holux GPS or all other brands work the same.
everytime it brought me all around singapore using small roads instead of expressways or main roads to reach the destination=S
A good example as follow:
from bugis to little india to serangoon, Geylang to Eunos and ....
finally then i reached Bedok, Audrey's house.
had a nice chatting session with her,Friends Forever =)