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I do not know about that particular unit, so someone familiar with it will give you better info, but, I would look for a way to enter LAT/LONG. coordinates. Make sure to enter them in the same format your unit expects, or is set up for. For instance, the Southwest Matlahuayl SMR boundary point at :
32deg 51.067min N
-117deg 16.400min W
The boundary points are easily available from the web. Between the points, straight lines usually connect them, but some have curved boundaries. All this is probably not needed if you purchased your unit with maps such as BlueChart, or another.
I'm sure good info will follow from others. Good luck
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