I have a couple of https://www.sparkfun.com/tutorials/176 am trying to add one as an external GPS to an APM 2 board and my board will not see it.

The GPS powers up ok and gets a fix, based on LED flashing.

What have I not done? I have disabled the onboard thus https://code.google.com/p/arducopter/wiki/GPSDisable

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try to make RX -TX crosswise. Maybe it helps.

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