[aprssig] USB and Rs-232 GPS's

[Chuck Gooden]

Could some one tell me if a hockey puck GPS that has a USB can 
be converted to use RS-232.  I have heard USB is just a serial 
protocol that can supply power and ground but I did not think it had 
the same voltage levels as RS-232. Is this correct?

I have seen some USB GPS's on ebay and am considering buying 
one to use with my D700 for aprs but it is USB instead of RS-232 
output.