Corrected entry: When the military sends the robot-transmitter through the stargate for a test, the mapping machine locates where in the galaxy the robot is transmitting from. One of the researchers says that the robot is 5 light years away. If something is 5 light years away and it's transmitting a signal to earth, it would take the radio signal 5 years to reach the earth! How did the robot let them know where it was so quickly? The signal couldn't go through the stargate, because a code to open the gate on the opposite side is required.
Corrected entry: At the beginning of the film when they are still trying to decipher the stone tablet, Jackson renames the 'Door to Heaven' a Stargate. He then works on deciphering the other symbols and determines that they are charts of constilations. A few scenes later when they operate the Stargate, crew members call it 'the Gate' and there is equipment already set up to track progress through the Gate. How did they know to call it a Stargate if he only just translated it as such, and how would they know they would have to track out in space?