entering coordinates

[+LECTRAGLIDE]

I am trying to enter some co ords from a historical site .The coordinates are from a map from the 30's.

When I try to enter them N42.1 W70.87 my gpsr brings me to a area that I know is in correct.

Does anyone know how these should be entered on gpsr?

Thanks

Edited February 22, 2010 by LECTRAGLIDE

[GermanSailor]

I am trying to enter some co ords from a historical site .The coordinates are from a map from the 30's.

When I try to enter them N42.1 W70.87 my gpsr brings me to a area that I know is in correct.

Does anyone know how these should be entered on gpsr?

Thanks

That looks (standing 234' away - man, you use large letters!) like decimal degrees.

 

If your GPSr is set to Degrees, Minutes, Dezimal-Minutes enter:

N 42° 06.000'

W 70° 52.200'

 

That might be the solution to your problem.

 

GermanSailor

[+Prime Suspect]

Also, the default map datum of your GPS didn't exist back in the 1930s. You'll need to figure out what was used back then, and set your GPS to match. Also, if you only have degrees and whole minutes, expect a high degree of imprecision. It could be anywhere to a half mile in error.

[+jopasm]

If it's a USGS topo from the 1930's the datum is probably NAD27 (North American Datum 1927). You should be able to set your GPS unit to use this and then follow some of the other suggestions to get you close to where the site is.

[+LECTRAGLIDE]

I am trying to enter some co ords from a historical site .The coordinates are from a map from the 30's.

When I try to enter them N42.1 W70.87 my gpsr brings me to a area that I know is in correct.

Does anyone know how these should be entered on gpsr?

Thanks

That looks (standing 234' away - man, you use large letters!) like decimal degrees.

 

If your GPSr is set to Degrees, Minutes, Dezimal-Minutes enter:

N 42° 06.000'

W 70° 52.200'

 

That might be the solution to your problem.

 

GermanSailor

1st off sorry about the large print in previous post. Now fixed .

Thankyou very much .That looks very close to where it shows on the old map .

Not sure how you did that and would be interested in know how.

Now I have to see if I can get to it.

Thanks again .

[+Unobtainium]

Just multiply the decimal degrees by 60 to get minutes

 

0.1 * 60 = 06.00

0.87 * 60 = 52.2

 

It is still worth looking at the datum as this could give some error too.

Edited February 22, 2010 by akettlet

[GermanSailor]

Not sure how you did that and would be interested in know how.

As it was said before.

 

60 minutes of arc are one degree.

 

Examples:

 

1.5° are 1° 30'

 

0.1° are 6'

 

0.15° are 9'

 

But you don't have to know this, nearly all GPSr can be configured to use DMS, DM.MMM or D.DDDDD

 

And there are lots of conversion tools on the internet.

 

GermanSailor