Datum
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pc_PrefDatum



Defined Datum - Choose desired datum. TeleType GPS maps use WGS84, which is the default setting. If you need to adjust thedisplay position of custom maps enter the appropriate datum values here. This feature will also adjust your current position by the selected amount in the specified direction. This feature can be used in areas where WGS84 is not the normal datum. Values for dz, dy, and dz are all in meters.  
·dx - Positive value will adjust your position to the east, negative will adjust to the west.  
·dy - Positive value will adjust your position to the north, negative will adjust to the south.  
·dz - Increases or decreases your altitude by the specified amount.  


warning
If you are not familiar with Datum, please do not make any adjustments to this indicator, as the wrong datum will not allow you to lock in or display maps properly!



Use Defined Datum - This will enable the datum modifications you have entered.