Hi Neil,
Thank for the reply, I have looked on the other thread, and I don’t think I can offer anything, I think you more experienced Astro navigators will be more helpful.
I put my Mark IXA together from two sacrificial models. I may have introduced errors that I don’t know about. I didn’t realise that the index error would be different with the 5 degree lever activated, but now you mention it, it’s obvious. Can you tell me how to check this? I have removed the averager due to excess friction, but I think I am going to have to fix this and put it back if I am to improve the accuracy.
All the best
Tom
3-4 miles is very good. If I get down to 10 miles I’ll be very pleased.
Thank for the reply, I have looked on the other thread, and I don’t think I can offer anything, I think you more experienced Astro navigators will be more helpful.
I put my Mark IXA together from two sacrificial models. I may have introduced errors that I don’t know about. I didn’t realise that the index error would be different with the 5 degree lever activated, but now you mention it, it’s obvious. Can you tell me how to check this? I have removed the averager due to excess friction, but I think I am going to have to fix this and put it back if I am to improve the accuracy.
All the best
Tom
(04-20-2025, 08:11 PM)neil_s Wrote: Well done for real Air Nav! I note from your posts above that your averager may not be working. This device takes a sample of the sextant's altitude setting once every second over the averaging elapsed time and sums them - displaying the result in the little window. I have two Mk IX BM models that I use in the back garden and the averager makes a big difference to the accuracy of your sights. From a chair on solid ground, I can get LOPs that pass within 3-4 miles of the GPS fix. You might have a look also at the post immediately below yours discussing the results achieved by war-time navigators - maybe 30 miles is not too bad!
Neil_s
3-4 miles is very good. If I get down to 10 miles I’ll be very pleased.