diff --git a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeoEllipsoid.kt b/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeoEllipsoid.kt
index 8e07710..ae59ab4 100644
--- a/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeoEllipsoid.kt
+++ b/maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeoEllipsoid.kt
@@ -1,7 +1,8 @@
 package center.sciprog.maps.coordinates
 
-import center.sciprog.maps.coordinates.GeoEllipsoid.Companion.greatCircleAngleBetween
-import kotlin.math.*
+import kotlin.math.acos
+import kotlin.math.pow
+import kotlin.math.sqrt
 
 
 public class GeoEllipsoid(public val equatorRadius: Distance, public val polarRadius: Distance) {
@@ -35,12 +36,12 @@ public class GeoEllipsoid(public val equatorRadius: Distance, public val polarRa
             polarRadius = Distance(6378.137)
         )
 
-        /**
-         * https://en.wikipedia.org/wiki/Great-circle_distance
-         */
-        public fun greatCircleAngleBetween(r1: GMC, r2: GMC): Radians = acos(
-            sin(r1.latitude) * sin(r2.latitude) + cos(r1.latitude) * cos(r2.latitude) * cos(r1.longitude - r2.longitude)
-        ).radians
+//        /**
+//         * https://en.wikipedia.org/wiki/Great-circle_distance
+//         */
+//        public fun greatCircleAngleBetween(r1: GMC, r2: GMC): Radians = acos(
+//            sin(r1.latitude) * sin(r2.latitude) + cos(r1.latitude) * cos(r2.latitude) * cos(r1.longitude - r2.longitude)
+//        ).radians
     }
 }
 
@@ -51,22 +52,22 @@ internal fun GeoEllipsoid.reducedRadius(latitude: Angle): Distance {
     val reducedLatitudeTan = (1 - f) * tan(latitude)
     return equatorRadius / sqrt(1.0 + reducedLatitudeTan.pow(2))
 }
-
-
-/**
- * Compute distance between two map points using giv
- * https://en.wikipedia.org/wiki/Geographical_distance#Lambert's_formula_for_long_lines
- */
-public fun GeoEllipsoid.lambertDistanceBetween(r1: GMC, r2: GMC): Distance {
-    val s = greatCircleAngleBetween(r1, r2)
-
-    val b1: Double = (1 - f) * tan(r1.latitude)
-    val b2: Double = (1 - f) * tan(r2.latitude)
-    val p = (b1 + b2) / 2
-    val q = (b2 - b1) / 2
-
-    val x = (s.value - sin(s)) * sin(p).pow(2) * cos(q).pow(2) / cos(s / 2).pow(2)
-    val y = (s.value + sin(s)) * cos(p).pow(2) * sin(q).pow(2) / sin(s / 2).pow(2)
-
-    return equatorRadius * (s.value - f / 2 * (x + y))
-}
\ No newline at end of file
+//
+//
+///**
+// * Compute distance between two map points using giv
+// * https://en.wikipedia.org/wiki/Geographical_distance#Lambert's_formula_for_long_lines
+// */
+//public fun GeoEllipsoid.lambertDistanceBetween(r1: GMC, r2: GMC): Distance {
+//    val s = greatCircleAngleBetween(r1, r2)
+//
+//    val b1: Double = (1 - f) * tan(r1.latitude)
+//    val b2: Double = (1 - f) * tan(r2.latitude)
+//    val p = (b1 + b2) / 2
+//    val q = (b2 - b1) / 2
+//
+//    val x = (s.value - sin(s)) * sin(p).pow(2) * cos(q).pow(2) / cos(s / 2).pow(2)
+//    val y = (s.value + sin(s)) * cos(p).pow(2) * sin(q).pow(2) / sin(s / 2).pow(2)
+//
+//    return equatorRadius * (s.value - f / 2 * (x + y))
+//}
\ No newline at end of file
diff --git a/maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/DistanceTest.kt b/maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/DistanceTest.kt
index 1a8a561..3cd6714 100644
--- a/maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/DistanceTest.kt
+++ b/maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/DistanceTest.kt
@@ -15,17 +15,6 @@ internal class DistanceTest {
         assertEquals(298.257223563, GeoEllipsoid.WGS84.inverseF, 1e-6)
     }
 
-    @Test
-    @Ignore
-    fun greatCircleDistance() {
-        assertEquals(
-            expected = 632.035,
-            actual = GeoEllipsoid.greatCircleAngleBetween(moscow, spb).value *
-                    GeoEllipsoid.WGS84.equatorRadius.kilometers,
-            absoluteTolerance = 0.1
-        )
-    }
-
     @Test
     fun curveBetween() {
         val curve = GeoEllipsoid.WGS84.curveBetween(moscow, spb)