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VK7ARN
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Joined: 24 May 2008
Posts: 2

PostPosted: Sun May 25, 2008 4:00 am    Post subject: Options Screen Reply with quote

Hi
Evaluating MobileLog before registering. Notice the options screen says "Use negative values for East" (which is unusual) and help says "positive values for East" Web site says "longitude (West = +)"
Roger Confused
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n0hr
Site Admin


Joined: 05 Feb 2007
Posts: 93
Location: Iowa

PostPosted: Sun May 25, 2008 3:04 pm    Post subject: Longitude East vs West (Positive/Negative) in MobileLog Reply with quote

Good catch. I'm fairly certain that the help is wrong and the website and screen are correct. I believe that I was following what most other ham radio software packages and data files (like cty.dat) follow on this... negative values for east.

Anyway, thanks for reporting the inconsistency.

73
Pat


Quote:

Hi
Evaluating MobileLog before registering. Notice the options screen says "Use negative values for East" (which is unusual) and help says "positive values for East" Web site says "longitude (West = +)"
Roger Confused
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VK7ARN
Novice


Joined: 24 May 2008
Posts: 2

PostPosted: Sun May 25, 2008 11:12 pm    Post subject: Re: Longitude East vs West (Positive/Negative) in MobileLog Reply with quote

No drama. I guess Google maps etc are perhaps the most universally used these days and I think negative South/West positive North/East applies therein.
Interesting Googling on this topic. If http://nationalatlas.gov/articles/mapping/a_latlong.html#three is an authority, they say

"The Earth is divided equally into 360 degrees of longitude. There are 180 degrees of longitude to the east of the Prime Meridian; when the directional designator is omitted these longitudes are given positive values. There are also 180 degrees of longitude to the west of the Prime Meridian; when the directional designator is omitted these longitudes are given negative values. The 180-degree longitude line is opposite the Prime Meridian on the globe, and is the same going either east or west."

Cheers
Roger
VK7ARN
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