# Geo destination point

`geo-destination-point` · version 1.0.0 · Geometry, location & color · free, no key needed

Compute the spherical destination from a start point, initial bearing, and distance; return latitude and longitude.

**Use when you need to: destination point from bearing and distance · find coordinates after traveling a distance · calculate endpoint from latitude longitude heading.**

## Decide before calling

Read the [versioned contract](/v1/tools/geo-destination-point/versions/1.0.0) and the supported scope below. Reuse `geo-destination-point@1.0.0` when your input, required output and limits match it. Choose another approach for an unsupported operation.

## Explain the choice

"I can use `geo-destination-point@1.0.0` for destination point from bearing and distance. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

## Supported

- destination point from bearing and distance
- find coordinates after traveling a distance
- calculate endpoint from latitude longitude heading
- move GPS point by kilometers and bearing
- great circle destination coordinates
- where do I end up from a point and azimuth

## Not supported

- ellipsoidal direct geodesic
- route waypoint generation

## Behavior

- Uses the spherical great-circle model, not a Karney or Vincenty ellipsoidal geodesic; Earth-model error is typically up to about 0.5%.
- Angles are decimal degrees; bearings are clockwise from true north and results are rounded to 12 decimal places.
- The default Earth radius is the IUGG mean radius 6371008.8 m; earth_radius_m makes the spherical radius explicit.

## Input

- `latitude_deg` (number, required): min -90; max 90
- `longitude_deg` (number, required): min -180; max 180
- `bearing_deg` (number, required): min 0
- `distance` (number, required): min 0; max 1000000000000
- `unit` (one of "m", "km", "mi", "nmi", required)
- `earth_radius_m` (number, optional): max 1000000000
- `precision_decimals` (number, optional): min 0; max 12

## Output

- `latitude_deg` (number, required): min -90; max 90
- `longitude_deg` (number, required): min -180; max 180
- `earth_radius_m` (number, required)
- `standard_version` (constant "Sinnott-1984/IUGG-GRS80", required)

## Limits

- max input bytes: 512
- max output bytes: 256
- max items: 7
- max iterations: 1

## Example

Request input:

```json
{
  "latitude_deg": 12.5,
  "longitude_deg": -45,
  "bearing_deg": 123,
  "distance": 0,
  "unit": "m"
}
```

Response:

```json
{
  "result": {
    "latitude_deg": 12.5,
    "longitude_deg": -45,
    "earth_radius_m": 6371008.8,
    "standard_version": "Sinnott-1984/IUGG-GRS80"
  }
}
```

## How to call it

### MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "geo-destination-point",
  "version": "1.0.0",
  "input": {
    "latitude_deg": 12.5,
    "longitude_deg": -45,
    "bearing_deg": 123,
    "distance": 0,
    "unit": "m"
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/geo-destination-point/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"latitude_deg":12.5,"longitude_deg":-45,"bearing_deg":123,"distance":0,"unit":"m"}'
```

The machine-readable contract is at [/v1/tools/geo-destination-point/versions/1.0.0](/v1/tools/geo-destination-point/versions/1.0.0).

### CLI

```sh
node cli.mjs run geo-destination-point 1.0.0 --input input.json --base-url https://computefirst.net
```

Get the client at [/clients/cli/](/clients/cli/).

## Related tools

- [Geo initial bearing](/tools/geo-initial-bearing): Compute the initial spherical bearing from point A to point B and return degrees clockwise from true north.
- [Geo haversine distance](/tools/geo-haversine-distance): Compute the spherical great-circle distance between two latitude/longitude points and return it in the requested unit.
- [Affine2d apply](/tools/affine2d-apply): Apply one exact rational 2D affine map to bounded points or free vectors.
- [Homography incidence verify](/tools/homography-incidence-verify): Verify exact point-line incidence before and after a 2D homography with certificates.
- [Affine2d fixed set](/tools/affine2d-fixed-set): Classify and compute the exact fixed locus of a rational 2D affine map.
- [Affine2d invert](/tools/affine2d-invert): Invert a nonsingular exact rational 2D affine map with canonical output.