When calculating magnetic declination...

[xnazzx]

Here's the questions....

What is the magnetic declination for a map dated 1991, with a declination of 6°59' E and a an annual change of 14.6' increasing? 9 calculate using 2004 as the current year)

Here's what I did...

2004 - 1991 = 13
13 x 14.6=  189.8 now, i forget does it round down to 189 or round up to 190?

 

[George Wallace]

What is the magnetic declination for a map dated 1991, with a declination of 6°59' E and a an annual change of 14.6' increasing? 9 calculate using 2004 as the current year)

Here's what I did...

2004 - 1991 = 13
13 x 14.6=  189.8 now, i forget does it round down to 189 or round up to 190?

You haven't finished you calculations yet.

You have to convert 189.8' to Degrees 189.8' /60'  =  3 Degrees 13.8 Minutes

Now you add that (as your Declination is Increasing)  to your 6°59' E  to get  10°12.8' E
   

 

[Michael OLeary]

Just check your GPS.  :dontpanic:

Well, that was helpful. Perhaps if you can't help answer an honest question, you should refrain from posting.

You haven't finished you calculations yet.

You have to convert 189.8' to Degrees 189.8' /60'  =  3 Degrees 13.8 Minutes

Now you add that (as your Declination is Increasing)  to your 6°59' E  to get  10°12.8' E
   

3 degrees = 180 minutes, therefore:

You have to convert 189.8' to Degrees 189.8' /60'  =  3 Degrees 9.8 Minutes

Now you add that (as your Declination is Increasing)  to your 6°59' E  to get  10°8.8' E

For setting declination on the ranger style compass thats between 10.1 and 10.2 degrees.


You can also try this utility that includes a Declination Calculator (caution, 4 Mb download):

http://regimentalrogue.com/products/UTMCalc.exe

 

[xnazzx]

Yeah, guys I wasnt sure if you had to round up or down. I knew the rest of the steps, so I just leave the decimal?

 

[George Wallace]

Guess I fail my math.   ;D  Don't know where the 13 came from.

 

[ryanmann356]

yeah its the declination that gets ya.  People say its easy but when ur under pressure during nsce its not  :-[