diff --git a/cache/binary/model.pb.go b/cache/binary/messages.pb.go
similarity index 83%
rename from cache/binary/model.pb.go
rename to cache/binary/messages.pb.go
index 6932c00..14849f4 100644
--- a/cache/binary/model.pb.go
+++ b/cache/binary/messages.pb.go
@@ -1,5 +1,5 @@
 // Code generated by protoc-gen-go.
-// source: binary/model.proto
+// source: cache/binary/messages.proto
 // DO NOT EDIT!
 
 package binary
@@ -172,6 +172,38 @@ func (m *Relation) GetMemberRoles() []string {
 	return nil
 }
 
+type DeltaCoords struct {
+	Ids              []int64 `protobuf:"zigzag64,1,rep,packed,name=ids" json:"ids,omitempty"`
+	Lats             []int64 `protobuf:"zigzag64,2,rep,packed,name=lats" json:"lats,omitempty"`
+	Lons             []int64 `protobuf:"zigzag64,3,rep,packed,name=lons" json:"lons,omitempty"`
+	XXX_unrecognized []byte  `json:"-"`
+}
+
+func (m *DeltaCoords) Reset()         { *m = DeltaCoords{} }
+func (m *DeltaCoords) String() string { return proto.CompactTextString(m) }
+func (*DeltaCoords) ProtoMessage()    {}
+
+func (m *DeltaCoords) GetIds() []int64 {
+	if m != nil {
+		return m.Ids
+	}
+	return nil
+}
+
+func (m *DeltaCoords) GetLats() []int64 {
+	if m != nil {
+		return m.Lats
+	}
+	return nil
+}
+
+func (m *DeltaCoords) GetLons() []int64 {
+	if m != nil {
+		return m.Lons
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterEnum("binary.Relation_MemberType", Relation_MemberType_name, Relation_MemberType_value)
 }
diff --git a/cache/binary/model.proto b/cache/binary/messages.proto
similarity index 77%
rename from cache/binary/model.proto
rename to cache/binary/messages.proto
index 5ede7f6..3ebc462 100644
--- a/cache/binary/model.proto
+++ b/cache/binary/messages.proto
@@ -27,3 +27,9 @@ message Relation {
     repeated MemberType member_types = 4;
     repeated string member_roles = 5;
 }
+
+message DeltaCoords {
+   repeated sint64 ids = 1 [packed = true];
+   repeated sint64 lats = 2 [packed = true];
+   repeated sint64 lons = 3 [packed = true];
+}
diff --git a/cache/delta.go b/cache/delta.go
index 88c16c2..6703aec 100644
--- a/cache/delta.go
+++ b/cache/delta.go
@@ -15,7 +15,7 @@ func (s Nodes) Len() int           { return len(s) }
 func (s Nodes) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 func (s Nodes) Less(i, j int) bool { return s[i].Id < s[j].Id }
 
-func packNodes(nodes []element.Node) *DeltaCoords {
+func packNodes(nodes []element.Node) *binary.DeltaCoords {
 	var lastLon, lastLat int64
 	var lon, lat int64
 	var lastId int64
@@ -36,10 +36,10 @@ func packNodes(nodes []element.Node) *DeltaCoords {
 		lastLat = lat
 		i++
 	}
-	return &DeltaCoords{Ids: ids, Lats: lats, Lons: lons}
+	return &binary.DeltaCoords{Ids: ids, Lats: lats, Lons: lons}
 }
 
-func unpackNodes(deltaCoords *DeltaCoords, nodes []element.Node) []element.Node {
+func unpackNodes(deltaCoords *binary.DeltaCoords, nodes []element.Node) []element.Node {
 	if len(deltaCoords.Ids) > cap(nodes) {
 		nodes = make([]element.Node, len(deltaCoords.Ids))
 	} else {
@@ -214,7 +214,7 @@ func (p *DeltaCoordsCache) getCoordsPacked(bunchId int64, nodes []element.Node)
 		// clear before returning
 		return nodes[:0], nil
 	}
-	deltaCoords := &DeltaCoords{}
+	deltaCoords := &binary.DeltaCoords{}
 	err = proto.Unmarshal(data, deltaCoords)
 	if err != nil {
 		return nil, err
diff --git a/cache/internal.pb.go b/cache/internal.pb.go
deleted file mode 100644
index 9960465..0000000
--- a/cache/internal.pb.go
+++ /dev/null
@@ -1,49 +0,0 @@
-// Code generated by protoc-gen-go.
-// source: cache/internal.proto
-// DO NOT EDIT!
-
-package cache
-
-import proto "code.google.com/p/goprotobuf/proto"
-import json "encoding/json"
-import math "math"
-
-// Reference proto, json, and math imports to suppress error if they are not otherwise used.
-var _ = proto.Marshal
-var _ = &json.SyntaxError{}
-var _ = math.Inf
-
-type DeltaCoords struct {
-	Ids              []int64 `protobuf:"zigzag64,1,rep,packed,name=ids" json:"ids,omitempty"`
-	Lats             []int64 `protobuf:"zigzag64,2,rep,packed,name=lats" json:"lats,omitempty"`
-	Lons             []int64 `protobuf:"zigzag64,3,rep,packed,name=lons" json:"lons,omitempty"`
-	XXX_unrecognized []byte  `json:"-"`
-}
-
-func (m *DeltaCoords) Reset()         { *m = DeltaCoords{} }
-func (m *DeltaCoords) String() string { return proto.CompactTextString(m) }
-func (*DeltaCoords) ProtoMessage()    {}
-
-func (m *DeltaCoords) GetIds() []int64 {
-	if m != nil {
-		return m.Ids
-	}
-	return nil
-}
-
-func (m *DeltaCoords) GetLats() []int64 {
-	if m != nil {
-		return m.Lats
-	}
-	return nil
-}
-
-func (m *DeltaCoords) GetLons() []int64 {
-	if m != nil {
-		return m.Lons
-	}
-	return nil
-}
-
-func init() {
-}
diff --git a/cache/internal.proto b/cache/internal.proto
deleted file mode 100644
index cee74f5..0000000
--- a/cache/internal.proto
+++ /dev/null
@@ -1,7 +0,0 @@
-package cache;
-
-message DeltaCoords {
-   repeated sint64 ids = 1 [packed = true];
-   repeated sint64 lats = 2 [packed = true];
-   repeated sint64 lons = 3 [packed = true];
-}