height of a point in a mesh

hello!

I'm currently working on a buoyancy system and I need a way to get the water level height of a specific point (the transform of my boat) I tried to do It myself, however, I had no success

I currently have two scripts working together to create the ocean effect:

 [System.Serializable]
 public class Wave
 {
     public float noisewalkSpeed;
     public Vector3 scale = new Vector3(0.1f, 0.1f, 0.1f);
     public Vector3 speed = new Vector3(1.0f, 1.0f, 1.0f);
     public Vector3 waveDistance = new Vector3(1.0f, 1.0f, 1.0f);
     public Vector3 noiseStrength = new Vector3(1.0f, 1.0f, 1.0f);
     public Vector3 noiseWalk = new Vector3(1.0f, 1.0f, 1.0f);
     public float waveHeight;

 public Vector3 GetWave(Vector3 coord)
 {
     Vector3 xyz_coord1 = Vector3.zero;
     Vector3 xyz_coord2 = Vector3.zero;

     xyz_coord1.x += Mathf.Cos((Time.time * speed.x + coord.z) / waveDistance.x) * scale.x;
     xyz_coord1.x += Mathf.PerlinNoise(coord.y + noiseWalk.x, coord.z + Mathf.Sin(Time.time * 0.1f)) * noiseStrength.x;

     xyz_coord1.y += Mathf.Sin((Time.time * speed.y + coord.z) / waveDistance.y) * scale.y;
     xyz_coord1.y += Mathf.PerlinNoise(coord.x + noiseWalk.y, coord.z + Mathf.Sin(Time.time * 0.1f)) * noiseStrength.y;

     xyz_coord2.y += Mathf.Sin((Time.time * speed.y + coord.x) / waveDistance.y) * scale.y;
     xyz_coord2.y += Mathf.PerlinNoise(coord.x + noiseWalk.y, coord.z + Mathf.Sin(Time.time * 0.1f)) * noiseStrength.y;

     xyz_coord1.z += Mathf.Cos((Time.time * speed.z + coord.x) / waveDistance.z) * scale.z;
     xyz_coord1.z += Mathf.PerlinNoise(coord.x + noiseWalk.z, coord.y + Mathf.Sin(Time.time * 0.1f)) * noiseStrength.z;

     waveHeight = xyz_coord1.y + xyz_coord2.y;
     return xyz_coord1 + xyz_coord2;
 }

}

and

public class Ocean : MonoBehaviour {

 Mesh waterMesh;
 private Vector3[] newVertices;
 private Vector3[] originalVertices;
 public Wave waveScript = new Wave();
 public float height;

 // Use this for initialization
 void Start()
 {
     waterMesh = this.GetComponent<MeshFilter>().mesh;
     originalVertices = waterMesh.vertices;
 }

 // Update is called once per frame
 void Update()
 {
     moveSea();
     waveScript.noiseWalk.z += waveScript.noisewalkSpeed * Time.deltaTime;
 }

 void moveSea()
 {
     newVertices = new Vector3[originalVertices.Length];

     for (int i = 0; i < originalVertices.Length; i++)
     {
         Vector3 vertice = originalVertices[i];
         vertice = transform.TransformPoint(vertice);
         vertice += waveScript.GetWave(vertice);
         newVertices[i] = transform.InverseTransformPoint(vertice);
     }
     waterMesh.vertices = newVertices;
     waterMesh.RecalculateNormals();
 }

}

any advice would be greatly appreciated!