diff --git a/demo/maps/src/jvmMain/kotlin/Main.kt b/demo/maps/src/jvmMain/kotlin/Main.kt
index 2c7ce6e..c32de21 100644
--- a/demo/maps/src/jvmMain/kotlin/Main.kt
+++ b/demo/maps/src/jvmMain/kotlin/Main.kt
@@ -10,8 +10,8 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
 import center.sciprog.maps.compose.*
-import center.sciprog.maps.GeodeticMapCoordinates
-import center.sciprog.maps.MapViewPoint
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.MapViewPoint
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.cio.CIO
 import kotlinx.coroutines.delay
diff --git a/demo/scheme/build.gradle.kts b/demo/scheme/build.gradle.kts
index 0222e52..2e64e6d 100644
--- a/demo/scheme/build.gradle.kts
+++ b/demo/scheme/build.gradle.kts
@@ -18,7 +18,7 @@ kotlin {
     sourceSets {
         val jvmMain by getting {
             dependencies {
-                implementation(projects.schemeKt)
+                implementation(projects.mapsKtScheme)
                 implementation(compose.desktop.currentOs)
                 implementation("ch.qos.logback:logback-classic:1.2.11")
             }
diff --git a/demo/scheme/src/jvmMain/kotlin/Main.kt b/demo/scheme/src/jvmMain/kotlin/Main.kt
index 98757de..8803fea 100644
--- a/demo/scheme/src/jvmMain/kotlin/Main.kt
+++ b/demo/scheme/src/jvmMain/kotlin/Main.kt
@@ -7,7 +7,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
-import center.sciprog.scheme.*
+import center.sciprog.maps.scheme.*
 
 @Composable
 @Preview
diff --git a/maps-kt-compose/build.gradle.kts b/maps-kt-compose/build.gradle.kts
index 1ec386f..ff95d07 100644
--- a/maps-kt-compose/build.gradle.kts
+++ b/maps-kt-compose/build.gradle.kts
@@ -1,5 +1,4 @@
 import org.jetbrains.compose.compose
-import org.jetbrains.compose.desktop.application.dsl.TargetFormat
 
 plugins {
     kotlin("multiplatform")
@@ -10,17 +9,19 @@ plugins {
 val ktorVersion: String by rootProject.extra
 
 kotlin {
+    explicitApi = org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode.Warning
     jvm {
         compilations.all {
             kotlinOptions.jvmTarget = "11"
         }
     }
     sourceSets {
-        commonMain{
-            dependencies{
-                api(projects.mapsKtCore)
+        commonMain {
+            dependencies {
+                api(projects.mapsKtCoordinates)
                 api(compose.foundation)
                 api("io.ktor:ktor-client-core:$ktorVersion")
+                api("io.github.microutils:kotlin-logging:2.1.23")
             }
         }
         val jvmMain by getting
diff --git a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/FeatureBuilder.kt b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/FeatureBuilder.kt
index 75df7ee..21920e4 100644
--- a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/FeatureBuilder.kt
+++ b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/FeatureBuilder.kt
@@ -8,7 +8,7 @@ import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
-import center.sciprog.maps.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
 
 typealias FeatureId = String
 
diff --git a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeature.kt b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeature.kt
index d80ac3d..76a4396 100644
--- a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeature.kt
+++ b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeature.kt
@@ -1,8 +1,6 @@
 package center.sciprog.maps.compose
 
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.drawscope.DrawScope
@@ -12,9 +10,9 @@ import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.IntSize
 import androidx.compose.ui.unit.dp
-import center.sciprog.maps.GeodeticMapCoordinates
-import center.sciprog.maps.GmcBox
-import center.sciprog.maps.wrapAll
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.GmcBox
+import center.sciprog.maps.coordinates.wrapAll
 
 //TODO replace zoom range with zoom-based representation change
 sealed class MapFeature(val zoomRange: IntRange) {
diff --git a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapView.kt b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapView.kt
index 1f1019e..7907875 100644
--- a/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapView.kt
+++ b/maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapView.kt
@@ -4,7 +4,7 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.DpSize
-import center.sciprog.maps.*
+import center.sciprog.maps.coordinates.*
 import kotlin.math.PI
 import kotlin.math.log2
 import kotlin.math.min
@@ -60,7 +60,7 @@ internal fun GmcBox.computeViewPoint(mapTileProvider: MapTileProvider): (canvasS
 }
 
 @Composable
-fun MapView(
+public fun MapView(
     mapTileProvider: MapTileProvider,
     box: GmcBox,
     features: Map<FeatureId, MapFeature> = emptyMap(),
diff --git a/maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapViewJvm.kt b/maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapViewJvm.kt
index 5fb3bb6..d3e41e7 100644
--- a/maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapViewJvm.kt
+++ b/maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapViewJvm.kt
@@ -16,7 +16,7 @@ import androidx.compose.ui.graphics.nativeCanvas
 import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.input.pointer.*
 import androidx.compose.ui.unit.*
-import center.sciprog.maps.*
+import center.sciprog.maps.coordinates.*
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.launch
 import mu.KotlinLogging
@@ -33,7 +33,7 @@ private fun Color.toPaint(): Paint = Paint().apply {
 private fun IntRange.intersect(other: IntRange) = max(first, other.first)..min(last, other.last)
 
 internal fun MapViewPoint.move(deltaX: Double, deltaY: Double): MapViewPoint {
-    val newCoordinates = center.sciprog.maps.GeodeticMapCoordinates.ofRadians(
+    val newCoordinates = center.sciprog.maps.coordinates.GeodeticMapCoordinates.ofRadians(
         (focus.latitude + deltaY / scaleFactor).coerceIn(
             -MercatorProjection.MAXIMUM_LATITUDE,
             MercatorProjection.MAXIMUM_LATITUDE
diff --git a/maps-kt-core/build.gradle.kts b/maps-kt-coordinates/build.gradle.kts
similarity index 59%
rename from maps-kt-core/build.gradle.kts
rename to maps-kt-coordinates/build.gradle.kts
index ce2a413..5ca05d2 100644
--- a/maps-kt-core/build.gradle.kts
+++ b/maps-kt-coordinates/build.gradle.kts
@@ -15,13 +15,4 @@ kotlin {
     js(IR) {
         browser()
     }
-    sourceSets {
-        commonMain {
-            dependencies {
-                api("io.github.microutils:kotlin-logging:2.1.23")
-            }
-        }
-        val jvmMain by getting
-        val jvmTest by getting
-    }
 }
\ No newline at end of file
diff --git a/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/Coordinates2D.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/Coordinates2D.kt
new file mode 100644
index 0000000..4466edd
--- /dev/null
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/Coordinates2D.kt
@@ -0,0 +1,11 @@
+package center.sciprog.maps.coordinates
+
+/**
+ * A marker interface for flat coordinates
+ */
+public interface Coordinates2D
+
+public interface CoordinateBox<T: Coordinates2D>{
+    public val a: T
+    public val b :T
+}
\ No newline at end of file
diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GeodeticMapCoordinates.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeodeticMapCoordinates.kt
similarity index 90%
rename from maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GeodeticMapCoordinates.kt
rename to maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeodeticMapCoordinates.kt
index bd8152b..0ce9a71 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GeodeticMapCoordinates.kt
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeodeticMapCoordinates.kt
@@ -1,11 +1,14 @@
-package center.sciprog.maps
+package center.sciprog.maps.coordinates
 
 import kotlin.math.PI
 
 /**
  * Geodetic coordinated
  */
-public class GeodeticMapCoordinates private constructor(public val latitude: Double, public val longitude: Double) {
+public class GeodeticMapCoordinates private constructor(
+    public val latitude: Double,
+    public val longitude: Double,
+): Coordinates2D {
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
@@ -43,9 +46,6 @@ public class GeodeticMapCoordinates private constructor(public val latitude: Dou
     }
 }
 
-internal typealias Gmc = GeodeticMapCoordinates
-
-
 //public interface GeoToScreenConversion {
 //    public fun getScreenX(gmc: GeodeticMapCoordinates): Double
 //    public fun getScreenY(gmc: GeodeticMapCoordinates): Double
diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GmcBox.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcBox.kt
similarity index 87%
rename from maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GmcBox.kt
rename to maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcBox.kt
index 5b5297b..aef5db5 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/GmcBox.kt
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcBox.kt
@@ -1,10 +1,13 @@
-package center.sciprog.maps
+package center.sciprog.maps.coordinates
 
 import kotlin.math.abs
 import kotlin.math.max
 import kotlin.math.min
 
-public class GmcBox(public val a: GeodeticMapCoordinates, public val b: GeodeticMapCoordinates)
+public data class GmcBox(
+    public override val a: GeodeticMapCoordinates,
+    public override val b: GeodeticMapCoordinates,
+) : CoordinateBox<GeodeticMapCoordinates>
 
 public fun GmcBox(
     latitudes: ClosedFloatingPointRange<Double>,
diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MapViewPoint.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MapViewPoint.kt
similarity index 96%
rename from maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MapViewPoint.kt
rename to maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MapViewPoint.kt
index 43a6836..022338f 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MapViewPoint.kt
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MapViewPoint.kt
@@ -1,4 +1,4 @@
-package center.sciprog.maps
+package center.sciprog.maps.coordinates
 
 import kotlin.math.pow
 
diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MercatorProjection.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MercatorProjection.kt
similarity index 97%
rename from maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MercatorProjection.kt
rename to maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MercatorProjection.kt
index 3155480..d018993 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/MercatorProjection.kt
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/MercatorProjection.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package center.sciprog.maps
+package center.sciprog.maps.coordinates
 
 import kotlin.math.*
 
diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/WebMercatorProjection.kt b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/WebMercatorProjection.kt
similarity index 98%
rename from maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/WebMercatorProjection.kt
rename to maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/WebMercatorProjection.kt
index 952e7da..4273080 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/WebMercatorProjection.kt
+++ b/maps-kt-coordinates/src/commonMain/kotlin/center/sciprog/maps/coordinates/WebMercatorProjection.kt
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package center.sciprog.maps
+package center.sciprog.maps.coordinates
 
 import kotlin.math.*
 
diff --git a/scheme-kt/build.gradle.kts b/maps-kt-scheme/build.gradle.kts
similarity index 91%
rename from scheme-kt/build.gradle.kts
rename to maps-kt-scheme/build.gradle.kts
index 285b7ab..bbeeec0 100644
--- a/scheme-kt/build.gradle.kts
+++ b/maps-kt-scheme/build.gradle.kts
@@ -1,6 +1,5 @@
 import org.jetbrains.compose.compose
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
     kotlin("multiplatform")
@@ -24,8 +23,9 @@ kotlin {
         withJava()
     }
     sourceSets {
-        commonMain{
-            dependencies{
+        commonMain {
+            dependencies {
+                api(projects.mapsKtCoordinates)
                 api("io.github.microutils:kotlin-logging:2.1.23")
                 api(compose.foundation)
             }
diff --git a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeCoordinates.kt b/maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeCoordinates.kt
similarity index 69%
rename from scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeCoordinates.kt
rename to maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeCoordinates.kt
index 122cdeb..652ab63 100644
--- a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeCoordinates.kt
+++ b/maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeCoordinates.kt
@@ -1,12 +1,17 @@
-package center.sciprog.scheme
+package center.sciprog.maps.scheme
 
+import center.sciprog.maps.coordinates.CoordinateBox
+import center.sciprog.maps.coordinates.Coordinates2D
 import kotlin.math.abs
 import kotlin.math.max
 import kotlin.math.min
 
-data class SchemeCoordinates(val x: Float, val y: Float)
+data class SchemeCoordinates(val x: Float, val y: Float) : Coordinates2D
 
-data class SchemeCoordinateBox(val a: SchemeCoordinates, val b: SchemeCoordinates)
+data class SchemeCoordinateBox(
+    override val a: SchemeCoordinates,
+    override val b: SchemeCoordinates,
+) : CoordinateBox<SchemeCoordinates>
 
 val SchemeCoordinateBox.top get() = max(a.y, b.y)
 val SchemeCoordinateBox.bottom get() = min(a.y, b.y)
diff --git a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeViewPoint.kt b/maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeViewPoint.kt
similarity index 95%
rename from scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeViewPoint.kt
rename to maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeViewPoint.kt
index 4e60dee..b57926d 100644
--- a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeViewPoint.kt
+++ b/maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/SchemeViewPoint.kt
@@ -1,4 +1,4 @@
-package center.sciprog.scheme
+package center.sciprog.maps.scheme
 
 import kotlin.math.pow
 
diff --git a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/FeatureBuilder.kt b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/FeatureBuilder.kt
similarity index 97%
rename from scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/FeatureBuilder.kt
rename to maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/FeatureBuilder.kt
index b7d85dd..0f08595 100644
--- a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/FeatureBuilder.kt
+++ b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/FeatureBuilder.kt
@@ -1,4 +1,4 @@
-package center.sciprog.scheme
+package center.sciprog.maps.scheme
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateMapOf
@@ -10,7 +10,7 @@ import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
-import center.sciprog.scheme.SchemeFeature.Companion.defaultScaleRange
+import center.sciprog.maps.scheme.SchemeFeature.Companion.defaultScaleRange
 
 typealias FeatureId = String
 
diff --git a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeFeature.kt b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeFeature.kt
similarity index 95%
rename from scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeFeature.kt
rename to maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeFeature.kt
index 475bdf2..8362531 100644
--- a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeFeature.kt
+++ b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeFeature.kt
@@ -1,4 +1,4 @@
-package center.sciprog.scheme
+package center.sciprog.maps.scheme
 
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
@@ -10,7 +10,7 @@ import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.IntSize
 import androidx.compose.ui.unit.dp
-import center.sciprog.scheme.SchemeFeature.Companion.defaultScaleRange
+import center.sciprog.maps.scheme.SchemeFeature.Companion.defaultScaleRange
 
 internal typealias FloatRange = ClosedFloatingPointRange<Float>
 
@@ -19,8 +19,6 @@ sealed class SchemeFeature(val scaleRange: FloatRange) {
 
     companion object {
         val defaultScaleRange = 0f..Float.MAX_VALUE
-        const val DEFAULT_RENDERING_ORDER = 0
-        const val BACKGROUND_RENDERING_ORDER = 1000
     }
 }
 
diff --git a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeView.kt b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeView.kt
similarity index 99%
rename from scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeView.kt
rename to maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeView.kt
index 25ce1c8..a05f56a 100644
--- a/scheme-kt/src/jvmMain/kotlin/center/sciprog/scheme/SchemeView.kt
+++ b/maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeView.kt
@@ -1,4 +1,4 @@
-package center.sciprog.scheme
+package center.sciprog.maps.scheme
 
 import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.gestures.drag
diff --git a/scheme-kt/src/jvmMain/resources/middle-earth.jpg b/maps-kt-scheme/src/jvmMain/resources/middle-earth.jpg
similarity index 100%
rename from scheme-kt/src/jvmMain/resources/middle-earth.jpg
rename to maps-kt-scheme/src/jvmMain/resources/middle-earth.jpg
diff --git a/settings.gradle.kts b/settings.gradle.kts
index a321853..e81ffc7 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -21,10 +21,10 @@ pluginManagement {
 
 
 include(
-    ":maps-kt-core",
+    ":maps-kt-coordinates",
     ":maps-kt-compose",
     ":demo:maps",
-    ":scheme-kt",
+    ":maps-kt-scheme",
     ":demo:scheme"
 )