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 Post subject: Wabakimi Prov Park Map
PostPosted: August 29th, 2018, 1:49 pm 
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Joined: August 21st, 2018, 8:42 pm
Posts: 1
CAUTION when using the 2014 1:150,000 Wabakimi Ontario Parks map.

In the map legend, in the section describing magnetic declination, the authors have mixed up latitude & longitude figures, with the result that magnetic declination is incorrectly reported as 57deg 47min W, for 2013. In reality declination (for 2018) according to the Natural Resources Canada magnetic declination calculator, is approximately 4 deg W. This is a huge error.

I'm not sure how they managed to do this. It's easy to accidentally transpose numbers, but in this case there were two red flags that should have been noticed by staff and prevented this error. First, reporting the latitude as 89 deg 30 min N, should have caught someone's attention, as at that latitude you should be in sight of Santa's workshop.

Second, anyone with experience working with map & compass in Canada should have recognized that the location of Wabakimi Park is near the agonic line, where declination is zero. Declination for the park would be expected to be a low number, like 4 W. Declination for St. John's Nfld is about 18 deg W & that is the geographic area with the largest W declination in the country.

I guess use of the reported 57 deg declination would result in instant confusion in the field, and recognition something was amiss and no harm would be done.

Let's just say that one doesn't expect to find this sort of error on government published maps. Maybe this is a good reason to stick to using maps from the NTS series.

Happy paddling.


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PostPosted: August 29th, 2018, 3:44 pm 
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Joined: December 19th, 2011, 4:44 pm
Posts: 526
Location: Waterloo, ON
Thanks for the post. Noted.

In that general area of northern Ontario, including Woodland Caribou Park, I tend to set my compass declination to 0˚. As you've noted, the area is very close to the agonic line, and in most cases, being off by 4-5˚ doesn't make any navigational difference in that type of landscape.

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PostPosted: August 30th, 2018, 12:37 am 
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Joined: July 12th, 2010, 7:44 am
Posts: 142
Location: Barrie Ontario
I purchased my map in 2015 and it's the same. never noticed until you mentioned it.
When I was planning I did see the note under the scale "This map is illustrative only. do not rely on it... " bla bla bla.
In a conversation with Uncle Phil he did imply that the map was not good for much more than planning a route and did stress that I take along a good set of topo's

Image[url=https://flic.kr/p/Nsn8Ly]

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Rob


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