DMS ↔ Decimal Degrees implementation

A source-bound implementation contract for DMS ↔ Decimal Degrees; deployment and executable qualification remain separate.

Status: VERIFIED_CLEANLifecycle: implementation-contract

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner: Guth Instruments
Lifecycle: verified-clean
Evidence ID: t4-149
Effect: Computation or source lookup only

Input and validation requirements

The extreme-magnitude vector exposes loss of the one-second fractional component when JavaScript Number arithmetic adds 1/3600 to 100000000000000000000. The negative-DMS vector also exposes an output-changing convention ambiguity unless the sign convention is explicitly defined.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "dms": "40°26′46″"
  },
  "expected_outputs": {
    "decimal_degrees": 40.44611111111111
  },
  "working": "40 + 26/60 + 46/3600 = 40 + 0.4333333333333333 + 0.0127777777777778 = 40.44611111111111°"
}

Other records

01Overview 02Mechanism 04Qualification

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

VERIFIED_LEDGER.json
evidence-tranche4/tranche4-results.json