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13-11-2012, 17:33
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#1
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Registered User
Join Date: Oct 2012
Location: Richmond, VA
Boat: 1975 Dufour 31
Posts: 273
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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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13-11-2012, 17:38
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#2
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: Lat/Lon Question
it would probably depend on where you are putting your cursor
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13-11-2012, 17:52
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#3
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Registered User
Join Date: Oct 2012
Location: Richmond, VA
Boat: 1975 Dufour 31
Posts: 273
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Re: Lat/Lon Question
Quote:
Originally Posted by atoll
it would probably depend on where you are putting your cursor
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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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13-11-2012, 18:12
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#4
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Moderator Emeritus
Join Date: Sep 2006
Posts: 4,663
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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
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do not appear to be related in this manner, so I don't know what's going on.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
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13-11-2012, 18:18
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#5
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: Lat/Lon Question
Quote:
Originally Posted by AirBoyzT
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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see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
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13-11-2012, 18:27
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#6
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Registered User
Join Date: Oct 2012
Location: Richmond, VA
Boat: 1975 Dufour 31
Posts: 273
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Re: Lat/Lon Question
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13-11-2012, 18:40
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#7
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: Lat/Lon Question
Quote:
Originally Posted by AirBoyzT
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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
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13-11-2012, 18:46
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#8
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Registered User
Join Date: Oct 2012
Location: Richmond, VA
Boat: 1975 Dufour 31
Posts: 273
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Re: Lat/Lon Question
Quote:
Originally Posted by atoll
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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lol as an Army guy I completely understand.....I guess I was thinking army navigation, not sailing
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14-11-2012, 06:54
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#9
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Registered User
Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 6,252
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Re: Lat/Lon Question
Quote:
Originally Posted by atoll
see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
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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.
__________________
CRYA Yachtmaster Ocean Instructor Evaluator, Sail
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)
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14-11-2012, 07:05
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#10
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CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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Re: Lat/Lon Question
Quote:
Originally Posted by atoll
see post no #4,sailor's,only use degrees, minutes and seconds to plot or navigate with
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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.
__________________
cruising is entirely about showing up--in boat shoes.
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