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| Would someone be able to explain to me how to change degree-minutes-seconds to degree-minutes-feet? I thank you ahead of time if you can help me out. | |
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Member
Posts: 1314
Location: Menasha, WI | I may be wrong but I don't believe there is a standard formula. AS you move further north, the distance between degrees longitude is reduced. Thus at the equator seconds will equal more feet than at the 45th parallel, at the 45th more than at the 60th, etc..... | |
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Member
Posts: 744
| I think Viking is right. However, if it would help you to convert Deg/min/sec into decimal degrees, use these numbers (or buy a calculator with a conversion button, my Casio has one)
1 second = .00027778 degrees
1 minute = .0166668 degrees
Dave S. | |
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Member
Posts: 213
Location: Forest Lake, MN | Some one correct me if I goof, I'm not awake yet.
One minute of lat/long at the equator is 6080 feet, one nautical mile, which is 60 second of arc. So at the equator, one second is 6080/60=101.33. Go with 101 feet per sec. That will work for any latitude equator to pole. For longitude you have to multiple the number by the cosine of the latitude. Up here a generalization of 45 degrees north for every thing should work close enough. .7071 That times 6080 would be 4299.2, round it to 4300. Then one sec is 71.65 feet, around here. Some one check my math.
This is why I prefer using UTM's. But up here, a generic one sec is 101' N-S by 72' E-W.
Why on earth would any one but me want to know this?
If you want to try and picture 100 feet, MN/DOT usually spaces the passing skip strips 50 feet, start of skip strip to to start of skip strip. The counties likely do too.
WarrenMN
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| thanks guys. I will try and figure this out. My handheld Garmin does it for me, but not my 188Sounder. I have some waypoints with both, and just wanted to condense them all the same. | |
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Member
Posts: 213
Location: Forest Lake, MN | Ok, you didn't want Degrees, Minutes, Feet. You wanted to go from DDD MMM SS.S to DDD MM.MMM You'd have been the only other person besides myself to have to do that.
Just divide what ever seconds you have by 60 and thats the decimal you want to put behind the Minutes.
I find it hard to believe your GPS doesn't give you that choice in its System Setup menu. I've never seen one that hasn't. Look in the instructions and look for Coordinate systems. If you still have trouble contact me. I'll see if I can down load the manual.
[email protected]
WarrenMN
PS I just looked up a manual and if I undersand what your trying to do, it was under Main menu - Units Tab - page 85 of your manual.
Is this the manual.
http://www.garmin.com/manuals/83_GPSMAP188_188C_238OwnersManual.pdf
Is this what you wanted to do?
Edited by WarrenMN 3/29/2005 5:04 PM
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| A huge Thanks WarrenMN for all the work you did. We are heading down to Detroit River pre-fishing for a couple tournaments and have some waypoints that I have to change, so when we get down there if there is still too much ice on the river I know what I will be doing! I have my manual all packed, so will check on the information in there like you said. Again thanks---too bad you don't live in Michigan! | |
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Member
Posts: 213
Location: Forest Lake, MN | Before you go to all that work, you do know that you can set the GPS to any coordinate system and put the points in and it converts them automatically. In fact the GPS its self uses its own coordinate system to compute where it is, how far to, what bearing, and then converts that into what ever you choose to read it as.
Ex. If you have a waypoint in DDD MM SS.ss, set the GPS to that and put them in. Then if you want it to display it as DDD MM.MMMM--- How ever many decimals it is - change it to that format and it displays it in that format.
EX. Some one gives you coordinates in UTM's, my favorite, change the GPS to use UTM's and plunk them in. When you done, change it back to DDD MM.MMM and poof, its done.
The last thing I'd do is sit and figure out what decimal minute my seconds are. UF DA! Let the GPS do what its suppose to do.
I do special maps for Bruce "Doc" Samson. If you read the Feb Walleye Insider, you might have seen some of the maps I do for Bruce. Seriously, let the GPS do the work. If you need help, yell.
WarrenMN | |
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Changing seconds to feet