Method and tables

FR

What's the difference between HO 249 and HO 229?

HO 249: whole-degree entry, ±1' — Sailing Canada and RYA standard. HO 229: interpolation possible, ±0.1' — taught in France (FFVoile), the US (US Sailing) and Japan. For recreational use, the difference is irrelevant: human sextant error greatly exceeds 1'. Sailcasted supports both.

Related questions

What are HO 249 sight reduction tables? Can I use a calculator? What is a line of position? What is dip correction?