# Page Not Found

The URL `deep-dive/a-guide-to-coordinate-systems-in-great-britain/transverse-mercator-map-projections/the-national-grid-reference-convention` does not exist.

You might be looking for one of these pages:
- [The National Grid reference convention](https://docs.os.uk/more-than-maps/a-guide-to-coordinate-systems-in-great-britain/transverse-mercator-map-projections/the-national-grid-reference-convention.md)
- [The International Terrestrial Reference Frame (ITRF)](https://docs.os.uk/more-than-maps/a-guide-to-coordinate-systems-in-great-britain/modern-gnss-coordinate-systems/the-international-terrestrial-reference-frame-itrf.md)
- [National Grid and the OSGB36 TRF](https://docs.os.uk/more-than-maps/a-guide-to-coordinate-systems-in-great-britain/ordnance-survey-coordinate-systems/national-grid-and-the-osgb36-trf.md)
- [The International GNSS Service (IGS)](https://docs.os.uk/more-than-maps/a-guide-to-coordinate-systems-in-great-britain/modern-gnss-coordinate-systems/the-international-gnss-service-igs.md)
- [Transverse Mercator map projections](https://docs.os.uk/more-than-maps/a-guide-to-coordinate-systems-in-great-britain/transverse-mercator-map-projections.md)

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