The United Kingdom Hydrographic Office

HMNAO have moved to www.GOV.UK/HMNAO

Her Majesty's Nautical Almanac Office (HMNAO) corporate content on the website has moved to GOV.UK.

All bookmarked pages on the website will automatically be redirected to here.

Visit the new HMNAO landing page at

For all other HMNAO web content please click here or use one of the direct links below.


Direct links for pages you may be looking for can be found below:

If you have any questions please email