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Trimble EZ-Guide 250

If using on a Raven 440 monitor the 250 needs to be programmed to output radar to that cable. The output is measured in Hz, the suggested  setting is 57-60 Hz. The Raven needs to be set to SP2 and a Speed Cal of around 600. This should get you speed on the Raven. Then adjust either the Raven speed Cal or the Hz on the 250 to get the speed to agree with the 250.