diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/Pilot3CoverageWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/Pilot3CoverageWalker.java
new file mode 100644
index 000000000..6405f2c50
--- /dev/null
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/Pilot3CoverageWalker.java
@@ -0,0 +1,133 @@
+package org.broadinstitute.sting.playground.gatk.walkers;
+
+import org.broadinstitute.sting.gatk.LocusContext;
+import org.broadinstitute.sting.gatk.refdata.ReferenceOrderedDatum;
+import org.broadinstitute.sting.gatk.refdata.rodDbSNP;
+import org.broadinstitute.sting.gatk.refdata.RefMetaDataTracker;
+import org.broadinstitute.sting.gatk.refdata.HapMapAlleleFrequenciesROD;
+import org.broadinstitute.sting.gatk.walkers.LocusWalker;
+import org.broadinstitute.sting.utils.Utils;
+import org.broadinstitute.sting.utils.cmdLine.Argument;
+import net.sf.samtools.SAMRecord;
+import net.sf.samtools.SAMFileHeader;
+import net.sf.samtools.SAMReadGroupRecord;
+
+import java.util.List;
+import java.util.Formatter;
+import static java.lang.Math.log10;
+
+import edu.mit.broad.picard.genotype.DiploidGenotype;
+import edu.mit.broad.picard.PicardException;
+
+public class Pilot3CoverageWalker extends LocusWalker<Integer, Integer> {
+
+    @Argument(fullName = "extended", shortName="ext", required=false, defaultValue = "false")
+    public boolean extendedOutput;
+
+    @Argument(fullName="min_mapq", shortName="mmq", required=false, defaultValue="1", doc="Minimum mapping quality of reads to consider") public Integer MIN_MAPQ;
+
+
+    public void initialize() {
+        out.println("track type=wiggle_0 name=Pilot3Coverage viewLimits=0:1");
+    }
+
+    public String walkerType() { return "ByLocus"; }
+
+    // Do we actually want to operate on the context?
+    public boolean filter(RefMetaDataTracker tracker, char ref, LocusContext context) {
+        return true;    // We are keeping all the reads
+    }
+
+
+
+    // Map over the org.broadinstitute.sting.gatk.LocusContext
+    int MAPPING_QUALITY_THRESHOLD = 1;
+    int totalSites;
+    int tumorCovered;
+    int normalCovered;
+    int somaticCovered;
+    long start = 0;
+
+    int lastContigIndex = -1;
+    long lastPosition = -1;
+
+    public Integer map(RefMetaDataTracker tracker, char ref, LocusContext context) {
+        if (start ==0) { start = System.currentTimeMillis(); }
+
+        List<SAMRecord> reads = context.getReads();
+        int totalDepth = 0;
+        int positiveStrandDepth = 0;
+        int negativeStrandDepth = 0;
+        for ( int i = 0; i < reads.size(); i++ )
+        {
+            SAMRecord read = reads.get(i);
+
+            // TODO: could this be done better elsewhere?
+            // only process primary, non duplicate alignments
+            // that come from fully mapped pairs with a mappign quality threshold >= x
+            if (read.getNotPrimaryAlignmentFlag() ||
+                read.getDuplicateReadFlag() ||
+                read.getReadUnmappedFlag() ||
+                read.getMappingQuality() < MIN_MAPQ
+//        ||
+//                read.getMateUnmappedFlag() ||
+                    ) {
+                continue;
+            }
+
+
+
+            totalDepth++;
+            if (read.getReadNegativeStrandFlag()) {
+                negativeStrandDepth++;
+            } else {
+                positiveStrandDepth++;
+            }
+
+        }
+
+
+        // if the contig index has changed OR if it's the same contig index but we jumped positions
+        // output a wiggle header
+        StringBuilder sb = new StringBuilder();
+        if (lastContigIndex != context.getLocation().getContigIndex() ||
+            lastPosition + 1 != context.getPosition()) {
+                lastContigIndex = context.getLocation().getContigIndex();
+                sb.append("fixedStep").append(" ")
+                  .append("chrom=").append(context.getContig()).append(" ")
+                  .append("start=").append(context.getPosition()).append(" ")
+                  .append("step=1")
+                  .append("\n");
+        }
+        lastPosition = context.getPosition();
+
+        if (extendedOutput) {
+            sb.append(context.getPosition()).append(" ");
+            sb.append(totalDepth).append(" ");
+            sb.append(positiveStrandDepth).append(" ");
+            sb.append(negativeStrandDepth).append(" ");
+        }
+
+        boolean siteCovered = (totalDepth >= 10 && positiveStrandDepth >= 2 && negativeStrandDepth >= 2);
+        sb.append((siteCovered)?"1":"0");
+
+        out.println(sb.toString());
+        return 1;
+    }
+
+    // Given result of map function
+    public Integer reduceInit() {
+        return 0;
+    }
+    public Integer reduce(Integer value, Integer sum) {
+        return value + sum;
+    }
+
+    @Override
+    public void onTraversalDone(Integer result) {
+//        out.println(String.format("FINAL - %d %d %d %d", totalSites, tumorCovered, normalCovered, somaticCovered));
+    }
+
+
+
+}
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