diff --git a/SimPEG/Survey.py b/SimPEG/Survey.py
index dc5aeadb..2d2a5a00 100644
--- a/SimPEG/Survey.py
+++ b/SimPEG/Survey.py
@@ -190,6 +190,106 @@ class Data(object):
                 indBot += rx.nD
 
 
+class Fields(object):
+    """Fancy Field Storage
+
+        u[:,'phi'] = phi
+        print u[tx0,'phi']
+
+    """
+
+    knownFields = None
+    txPair = BaseTx
+
+    def __init__(self, mesh, survey, **kwargs):
+        self.survey = survey
+        self.mesh = mesh
+        Utils.setKwargs(self, **kwargs)
+        self._fields = {}
+
+    def _initStore(self, name):
+        if name in self._fields:
+            return self._fields[name]
+
+        assert name in self.knownFields, 'field name is not known.'
+
+        loc = self.knownFields[name]
+
+        nP = {'CC': self.mesh.nC,
+              'F':  self.mesh.nF,
+              'E':  self.mesh.nE}[loc]
+
+        nTx = self.survey.nTx
+        field = np.empty((nP, nTx))
+
+        self._fields[name] = field
+
+        return field
+
+    def _indexAndNameFromKey(self, key):
+        if type(key) is not tuple:
+            key = (key,)
+        if len(key) == 1:
+            key += (None,)
+
+        assert len(key) == 2, 'must be [Tx, fieldName]'
+
+        txTestList, name = key
+
+        if name is not None and name not in self.knownFields:
+            raise KeyError('Invalid field name')
+
+        if type(txTestList) is slice:
+            ind = txTestList
+        else:
+            if type(txTestList) is not list:
+                txTestList = [txTestList]
+            for txTest in txTestList:
+                if not isinstance(txTest, self.txPair):
+                    raise KeyError('First index must be a Transmitter')
+                if txTest not in self.survey.txList:
+                    raise KeyError('Invalid Transmitter, not in survey list.')
+
+            ind = np.in1d(self.survey.txList, txTestList)
+
+        return ind, name
+
+    def __setitem__(self, key, value):
+        ind, name = self._indexAndNameFromKey(key)
+        if name is None:
+            freq = key
+            assert type(value) is dict, 'New fields must be a dictionary, if field is not specified.'
+            newFields = value
+        elif name in self.knownFields:
+            assert type(value) is np.ndarray, 'Must be set to a numpy array'
+            newFields = {name: value}
+        else:
+            raise Exception('Unknown setter')
+
+        for name in newFields:
+            field = self._initStore(name)
+            NEWF = newFields[name]
+            if field.shape[1] == 1 or NEWF.ndim == 1:
+                NEWF = Utils.mkvc(NEWF,2)
+            field[:,ind] = NEWF
+
+    def __getitem__(self, key):
+        ind, name = self._indexAndNameFromKey(key)
+        if name is None:
+            out = {}
+            for name in self._fields:
+                out[name] = self._fields[name][:,ind]
+                if out[name].shape[1] == 1:
+                    out[name] = Utils.mkvc(out[name])
+            return out
+
+        out = self._fields[name][:,ind]
+        if out.shape[1] == 1:
+            out = Utils.mkvc(out)
+        return out
+
+
+
 class BaseSurvey(object):
     """Survey holds the observed data, and the standard deviations."""
 
diff --git a/SimPEG/Tests/test_Survey.py b/SimPEG/Tests/test_Survey.py
index f9866bb5..3a40cddf 100644
--- a/SimPEG/Tests/test_Survey.py
+++ b/SimPEG/Tests/test_Survey.py
@@ -1,7 +1,7 @@
 import unittest
 from SimPEG import *
 
-class DataTest(unittest.TestCase):
+class DataAndFieldsTest(unittest.TestCase):
 
     def setUp(self):
         mesh = Mesh.TensorMesh([np.ones(n)*5 for n in [10,11,12]],[0,0,-30])
@@ -20,6 +20,7 @@ class DataTest(unittest.TestCase):
         txList = [Tx0,Tx1,Tx2,Tx3,Tx4]
         survey = Survey.BaseSurvey(txList=txList)
         self.D = Survey.Data(survey)
+        self.F = Survey.Fields(mesh, survey, knownFields={'phi':'CC','e':'E','b':'F'})
         self.Tx0 = Tx0
         self.Tx1 = Tx1
         self.mesh = mesh
@@ -45,7 +46,54 @@ class DataTest(unittest.TestCase):
         txs += [txs[0]]
         self.assertRaises(AssertionError, Survey.BaseSurvey, txList=txs)
 
+    def test_SetGet(self):
+        F = self.F
+        nTx = F.survey.nTx
+        e = np.random.rand(F.mesh.nE, nTx)
+        F[:, 'e'] = e
+        b = np.random.rand(F.mesh.nF, nTx)
+        F[:, 'b'] = b
 
+        self.assertTrue(np.all(F[:, 'e'] == e))
+        self.assertTrue(np.all(F[:, 'b'] == b))
+        F[:] = {'b':b,'e':e}
+        self.assertTrue(np.all(F[:, 'e'] == e))
+        self.assertTrue(np.all(F[:, 'b'] == b))
+
+        b = np.random.rand(F.mesh.nF,1)
+        F[self.Tx0, 'b'] = b
+        self.assertTrue(np.all(F[self.Tx0, 'b'] == Utils.mkvc(b)))
+
+        b = np.random.rand(F.mesh.nF)
+        F[self.Tx0, 'b'] = b
+        self.assertTrue(np.all(F[self.Tx0, 'b'] == b))
+
+        phi = np.random.rand(F.mesh.nC,2)
+        F[[self.Tx0,self.Tx1], 'phi'] = phi
+        self.assertTrue(np.all(F[[self.Tx0,self.Tx1], 'phi'] == phi))
+
+        fdict = F[:]
+        self.assertTrue(type(fdict) is dict)
+        self.assertTrue(sorted([k for k in fdict]) == ['b','e','phi'])
+
+        b = np.random.rand(F.mesh.nF, 2)
+        F[[self.Tx0, self.Tx1],'b'] = b
+        self.assertTrue(F[self.Tx0]['b'].shape == (F.mesh.nF,))
+        self.assertTrue(F[self.Tx0,'b'].shape == (F.mesh.nF,))
+        self.assertTrue(np.all(F[self.Tx0,'b'] == b[:,0]))
+        self.assertTrue(np.all(F[self.Tx1,'b'] == b[:,1]))
+
+    def test_assertions(self):
+        freq = [self.Tx0, self.Tx1]
+        bWrongSize = np.random.rand(self.F.mesh.nE, self.F.survey.nTx)
+        def fun(): self.F[freq, 'b'] = bWrongSize
+        self.assertRaises(ValueError, fun)
+        def fun(): self.F[-999.]
+        self.assertRaises(KeyError, fun)
+        def fun(): self.F['notRight']
+        self.assertRaises(KeyError, fun)
+        def fun(): self.F[freq,'notThere']
+        self.assertRaises(KeyError, fun)
 
 if __name__ == '__main__':
     unittest.main()