I just want to say that it is very important for me to be able to watch your videos In several languages. I know most European languages and now I am learning Indonesian and in the nearest future, I am also planning even to teach it. So thank you I like your videos very much.
If you have a compass in radians you do not have to calculate distance off target because the radians are a percentage of distance travelled to distance off target. Eg: 15° × pi ÷ 180 = 0.2617. So 1250 × 0.2617 = 327.125. Maybe that is why military uses radians
I watched a previous video about how far off track you can be with compass error. And you calculated it using cosine and sine rules. I came across a short cut pilots use called the one in sixty rule. Sixty being picked for easy mental maths a more precise number is 57.3. If you walk 1250 meters with an error of 15° all you have to do is 1250 ÷ 57.3 × 15 = 327.22 meters. So distance ÷ by 57.3 × degrees of error. Thought some may find this handy. Love all your videos, please keep them coming.
Crystal clear explanation (as usual), thanks. The auto dub feature is intriguing- I really wish I could speak another language… it would be very interesting to see/ hear how it handles the ‘waffle’ (the best bits?) when it happens!! I bet that would make it even more entertaining?! 😂
Good question. As you’re not walking to any intermediate points you’ll be walking from your location, on a bearing towards your destination, which (to start with, is lined up with something in the distance/on the horizon/etc). It’s normal to come off the bearing now and again - to step around rocks, wet ground, just normal walking, etc - and once you have gone around the obstacle you’ll still be walking towards the feature in the distance. Each time you do this you’ll come further off your baring and still walking towards the feature in the distance (not the destination), so you’ll end up walking along an arc shaped path. ALWAYS walk to something you can arrive at, NOT something on the horizon. And yes I know there are very famous navigation books which tell you to pick something on the horizon - those books are wrong. Oh there are ways to get back on your baring, see my video on back-barings: th-cam.com/video/61uMkv19Uyw/w-d-xo.htmlfeature=shared
Thank you so much for the quick reply. I now have a better understanding for your reasoning. Thanks for the referenced video however I've watched every episode you've posted on this channel. Have a great weekend.
Another excellent video. What is the "best" or "standard" way of giving someone else a bearing to walk so they know or understand that the bearings are adjusted for declination? Thanks
Say Grid or Magnetic after the bearing and most people will understand. For example 123 Grid is taken from a map and not adjusted for declination. Or 345 Magnetic had been adjusted (or from a feature and doesn't need adjusting)
About adjustments for magnetic declination in compasses: using the fixed compass (like the Silva in the video) are we required to adjust for magnetic declination every time before taking a bearing?
Yes. Map points to True North and compasses point to Magnetic North. If you go from one to the other you need to adjust for the local declination (the different between north on the map and the direction the compass needle points to).
@TheMapReadingCompany Thanks! So what is the advantage of buying a Silva over a Suunto? Isn't it better to adjust for magnetic declination once every few months/years rather than every single measurement we take?
Just my opinion so some people will disagree but I would say it's down to personal choice. Some prefer Suunto, some prefer Silva, others prefer other types. As long as you can navigate safely with whatever you have then that's fine. As for the compass declination - I just prefer to do everything manually, but, again, other people prefer to turn the screw on the compass.
Well done! Thanks from Canada.
I just want to say that it is very important for me to be able to watch your videos In several languages. I know most European languages and now I am learning Indonesian and in the nearest future, I am also planning even to teach it. So thank you I like your videos very much.
If you have a compass in radians you do not have to calculate distance off target because the radians are a percentage of distance travelled to distance off target. Eg: 15° × pi ÷ 180 = 0.2617. So 1250 × 0.2617 = 327.125. Maybe that is why military uses radians
Excellent 👍
I watched a previous video about how far off track you can be with compass error. And you calculated it using cosine and sine rules. I came across a short cut pilots use called the one in sixty rule. Sixty being picked for easy mental maths a more precise number is 57.3. If you walk 1250 meters with an error of 15° all you have to do is 1250 ÷ 57.3 × 15 = 327.22 meters. So distance ÷ by 57.3 × degrees of error.
Thought some may find this handy. Love all your videos, please keep them coming.
Thank you Stephen
Very helpful indeed. I can now send the link to my friends too!
Crystal clear explanation (as usual), thanks.
The auto dub feature is intriguing-
I really wish I could speak another language…
it would be very interesting to see/ hear how it handles the ‘waffle’ (the best bits?) when it happens!!
I bet that would make it even more entertaining?! 😂
🤣
Wayne, can you explain why you would walk in an arc if you pick something in the distance. 7:23
Good question. As you’re not walking to any intermediate points you’ll be walking from your location, on a bearing towards your destination, which (to start with, is lined up with something in the distance/on the horizon/etc).
It’s normal to come off the bearing now and again - to step around rocks, wet ground, just normal walking, etc - and once you have gone around the obstacle you’ll still be walking towards the feature in the distance. Each time you do this you’ll come further off your baring and still walking towards the feature in the distance (not the destination), so you’ll end up walking along an arc shaped path.
ALWAYS walk to something you can arrive at, NOT something on the horizon.
And yes I know there are very famous navigation books which tell you to pick something on the horizon - those books are wrong.
Oh there are ways to get back on your baring, see my video on back-barings:
th-cam.com/video/61uMkv19Uyw/w-d-xo.htmlfeature=shared
Thank you so much for the quick reply. I now have a better understanding for your reasoning. Thanks for the referenced video however I've watched every episode you've posted on this channel. Have a great weekend.
Another excellent video. What is the "best" or "standard" way of giving someone else a bearing to walk so they know or understand that the bearings are adjusted for declination? Thanks
Say Grid or Magnetic after the bearing and most people will understand.
For example 123 Grid is taken from a map and not adjusted for declination. Or 345 Magnetic had been adjusted (or from a feature and doesn't need adjusting)
About adjustments for magnetic declination in compasses: using the fixed compass (like the Silva in the video) are we required to adjust for magnetic declination every time before taking a bearing?
Yes. Map points to True North and compasses point to Magnetic North. If you go from one to the other you need to adjust for the local declination (the different between north on the map and the direction the compass needle points to).
@TheMapReadingCompany Thanks! So what is the advantage of buying a Silva over a Suunto? Isn't it better to adjust for magnetic declination once every few months/years rather than every single measurement we take?
Just my opinion so some people will disagree but I would say it's down to personal choice. Some prefer Suunto, some prefer Silva, others prefer other types. As long as you can navigate safely with whatever you have then that's fine.
As for the compass declination - I just prefer to do everything manually, but, again, other people prefer to turn the screw on the compass.
@@TheMapReadingCompany Thanks!
Surely winter hill mast would have been the most obvious reference 😂
Sehr gut!
👍