#### Mark-1

##### Well-known member

He has no formal astro nav knowledge but attempts to find his position using nothing but common sense:

- He works out his lat from the angle of the Polar Star making no corrections.

- He works out his long from the difference between local mid day and Greenwich mid day, again making no corrections.

Assuming his measurement for the height of the north star & the time of local mid day are perfectly accurate, what is the worst case error in his position using this somewhat Heath Robinson method?