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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Geolocator
# Description: A production-ready geolocation API using FastAPI, Pydantic, and CUDA
# Author: Elite Software Architect

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
import cupy as cp
import numpy as np

app = FastAPI()

class GeolocationRequest(BaseModel):
    """Request model for geolocation"""
    latitude: float
    longitude: float
    radius: float

class GeolocationResponse(BaseModel):
    """Response model for geolocation"""
    island_name: str
    distance: float

def calculate_distance(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
    """
    Calculate the distance between two points on the Earth's surface using the Haversine formula.

Args:
    lat1 (float): Latitude of the first point
    lon1 (float): Longitude of the first point
    lat2 (float): Latitude of the second point
    lon2 (float): Longitude of the second point

Returns:
    float: Distance between the two points in kilometers
    """
    # Convert coordinates

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