| Answer | Crossword Clue |
|---|---|
| BENCHMARKS | Points of reference, for surveyors. |
| BENCHMARK | Surveyor's reference |
| benchmarks | A surveyor's mark cut in a wall, pillar, or building and used as a reference point in measuring altitudes |
| benchmark | A surveyor's mark cut in a wall, pillar, or building and used as a reference point in measuring altitudes |
| BENCHMARKS | Reference points. |
| DATUMS | Topographers' reference points |
| LODESTARS | Navigational reference points |
