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Old 13-11-2012, 18:33   #1
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Lat/Lon Question

probably a dumb question, but I am currently using Bloo See to just plot out a course because it gives you nautical miles, Lat/Lon, etc. (Still plan on using Garmin, Charts, Etc while underway, this is just for home use)...

I did notice that the Lat and Lon differs dramatically it seems on marina websites and on Bloo See and google maps (Bloo See and Google Maps are the same). Is there a reason for this?
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Old 13-11-2012, 18:38   #2
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Re: Lat/Lon Question

it would probably depend on where you are putting your cursor
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Old 13-11-2012, 18:52   #3
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Re: Lat/Lon Question

Quote:
Originally Posted by atoll View Post
it would probably depend on where you are putting your cursor
I thought that, but it's way off....Marina where my boat is docked (Coles Point Marina) Website says Latitude: 38.1527N and Longitude: 76.6068W

On bloosee I have it marked as 38.8938N and Longitude: 76.993W....way off, and I have noticed other websites are off as well....I'm assuming google maps is just off but really unsure....38.1527 is far from 38.8938.....
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Old 13-11-2012, 19:12   #4
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Re: Lat/Lon Question

Are you sure that you are being consistent with your representation of degrees? You will see decimal degrees, degrees and decimal minutes, and degrees, minutes, seconds.

For example, mid-span of the Golden Gate Bridge is:
37 degrees, 49 minutes, 12 seconds north, 122 degrees, 28 minutes 44 seconds west.

37 degrees, 49.2000 minutes north, 122 degrees, 28.7333 minutes west.

37.82000 degrees north, 122.478888 degrees west.

These are all the same spot on the earth, at least if I did my math correctly. Sometimes people use decimal points as degree/minute separators, which can get really confusing.

However, your numbers:
Quote:
38.1527 is far from 38.8938
do not appear to be related in this manner, so I don't know what's going on.
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Old 13-11-2012, 19:18   #5
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Re: Lat/Lon Question

Quote:
Originally Posted by AirBoyzT View Post
I thought that, but it's way off....Marina where my boat is docked (Coles Point Marina) Website says Latitude: 38.1527N and Longitude: 76.6068W

On bloosee I have it marked as 38.8938N and Longitude: 76.993W....way off, and I have noticed other websites are off as well....I'm assuming google maps is just off but really unsure....38.1527 is far from 38.8938.....
see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
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Old 13-11-2012, 19:27   #6
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Re: Lat/Lon Question

Thanks, found this site which was helpful....I feel like an idiot....

Convert Latitude / Longitude in Degrees/Minutes/Seconds to/from Decimal (FCC) USA
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Old 13-11-2012, 19:40   #7
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Re: Lat/Lon Question

Quote:
Originally Posted by AirBoyzT View Post
Thanks, found this site which was helpful....I feel like an idiot....

Convert Latitude / Longitude in Degrees/Minutes/Seconds to/from Decimal (FCC) USA
don't worry this is why we have the Royal Marines in the uk,otherwise near the water the Army "pongos" would be permernantly lost
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Old 13-11-2012, 19:46   #8
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Re: Lat/Lon Question

Quote:
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don't worry this is why we have the Royal Marines in the uk,otherwise near the water the Army "pongos" would be permernantly lost
lol as an Army guy I completely understand.....I guess I was thinking army navigation, not sailing
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Old 14-11-2012, 07:54   #9
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Re: Lat/Lon Question

Quote:
Originally Posted by atoll View Post
see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
Really?

Most of my navigation is degrees, minutes, 1/10's of minutes. I have not seen a paper chart that uses seconds, that includes 1/5,000 harbour charts.
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Old 14-11-2012, 08:05   #10
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Re: Lat/Lon Question

Quote:
Originally Posted by atoll View Post
see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
Hmmm. In celestial navigation, seconds are rarely used in my neck of the woods. Degrees, minutes and decimals of a minute seem to be standard.
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