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derstosstrupp · 10-10-20, 10:59 AM

If you use your DR as the assumed position and thereby keep the intercepts short, the longitude thing won’t be an issue. Problems arise when you use methods like HO 229 that require plotting from a whole degree of lat/long because the intercepts can be large.

If you do want to use larger intercepts, take the difference in minutes of longitude between assumed position and fix, and divide by the cosine of the latitude. Then shift the fix horizontally by the difference.

So say you plotted from 54 deg N, 2 deg E assumed position and got your fix at 53 deg 48’ N and 2 deg 13’ E. The difference in minutes is 13, so take 13 / cos (53.8) which gives 22. So your fix is 53 deg 48’ N, 2 deg 22’ E..

10-10-20, 10:59 AM	#13
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 892 Downloads: 489 Uploads: 0	If you use your DR as the assumed position and thereby keep the intercepts short, the longitude thing won’t be an issue. Problems arise when you use methods like HO 229 that require plotting from a whole degree of lat/long because the intercepts can be large. If you do want to use larger intercepts, take the difference in minutes of longitude between assumed position and fix, and divide by the cosine of the latitude. Then shift the fix horizontally by the difference. So say you plotted from 54 deg N, 2 deg E assumed position and got your fix at 53 deg 48’ N and 2 deg 13’ E. The difference in minutes is 13, so take 13 / cos (53.8) which gives 22. So your fix is 53 deg 48’ N, 2 deg 22’ E.. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ