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diff --git a/lib/postrunner/DataSources.rb b/lib/postrunner/DataSources.rb
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+#!/usr/bin/env ruby -w
+# encoding: UTF-8
+#
+# = DataSources.rb -- PostRunner - Manage the data from your Garmin sport devices.
+#
+# Copyright (c) 2015 by Chris Schlaeger <cs@taskjuggler.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of version 2 of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+
+require 'fit4ruby'
+
+require 'postrunner/FlexiTable'
+require 'postrunner/ViewFrame'
+require 'postrunner/DeviceList'
+
+module PostRunner
+
+  # The DataSources objects can generate a table that lists all the data
+  # sources in chronological order that were in use during a workout.
+  class DataSources
+
+    include Fit4Ruby::Converters
+
+    # Create a DataSources object.
+    # @param activity [Activity] The activity to analyze.
+    # @param unit_system [Symbol] The unit system to use (:metric or
+    #        :imperial )
+    def initialize(activity, unit_system)
+      @activity = activity
+      @fit_activity = activity.fit_activity
+      @unit_system = unit_system
+    end
+
+    def to_s
+      data_sources.to_s
+    end
+
+    def to_html(doc)
+      ViewFrame.new("Data Sources", 1210, data_sources).to_html(doc)
+    end
+
+    private
+
+    def data_sources
+      session = @fit_activity.sessions[0]
+
+      t = FlexiTable.new
+      t.enable_frame(false)
+      t.body
+      t.row([ 'Time', 'Distance', 'Mode', 'Distance', 'Speed',
+              'Cadence', 'Elevation', 'Heart Rate', 'Power', 'Calories'  ])
+      start_time = session.start_time
+      @fit_activity.data_sources.each do |source|
+        t.cell(secsToHMS(source.timestamp - start_time))
+        t.cell(distance(source.timestamp))
+        t.cell(source.mode)
+        t.cell(device_name(source.distance))
+        t.cell(device_name(source.speed))
+        t.cell(device_name(source.cadence))
+        t.cell(device_name(source.elevation))
+        t.cell(device_name(source.heart_rate))
+        t.cell(device_name(source.power))
+        t.cell(device_name(source.calories))
+        t.new_row
+      end
+
+      t
+    end
+
+    def device_name(index)
+      @fit_activity.device_infos.each do |device|
+        if device.device_index == index
+          return (DeviceList::DeviceTypeNames[device.device_type] ||
+                  device.device_type) + " [#{device.device_index}]"
+        end
+      end
+
+      ''
+    end
+
+    def distance(timestamp)
+      @fit_activity.records.each do |record|
+        if record.timestamp >= timestamp
+          unit = { :metric => 'km', :statute => 'mi'}[@unit_system]
+          value = record.get_as('distance', unit)
+          return '-' unless value
+          return "#{'%.2f %s' % [value, unit]}"
+        end
+      end
+
+      '-'
+    end
+
+  end
+
+end
+