Hi Rodney,

All I know is that mariners use this rule for latitude, 1 minute is a mile

(nautical mile, that is). Longitude is a little more complicated and I think

it depends where on planet Earth you happen to be. Personally, when I use my

gps I keep it in UTM (Universal Transverse Mercator (?)) mode where it gives

coordinates much like a military grid system. Everything is in meters (or

Km). That way, I can see how many meters I have gone and convert (if

necessary) to feet, miles, etc. After awhile, I have gotten comfortable

using meters and Km. If you are moving at an angle, you can see how far

East and North and just use the right triangle rule to figure out your

actual distance change. Much easier.

I never use lat/lon, because, to me, it is just way too confusing. USGS topo

maps list both systems of coordinates, so I use the easier and more

convenient UTM.

From the coordinates you gave above, assuming North latitude and West

longitude, you are somewhere in Maine,USA?

hth,

Joe

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Hi Rodney,

I agree with Joe. If you've got a UTM setting for lat/long on your

GPS, use it-it's a lot easier. If you don't, but have a topo map of

the area, it's probably what they call a 7 1/2 minute map, which means

it spans 7 1/2 minutes worth of long X 7 1/2 minutes worth of lat. It

will also have line scales at the bottom, in miles, feet, and

meters/km. Since it looks like your units will want to be in feet,

use the feet scale to measure the width(long,A) and height(lat,B) of

the map area. 7.5 minutes = 0.125 degrees, so the conversion factor

from degrees to distance at this point on the earth is A/.125

ft/degree for long and B/.125 ft/degree for lat. Convert your GPS

measured lats and longs to decimal degrees if need be. Then subtract

the lat of the two point and multiply by your lat factor. Do the same

for the long points and multiply by your long factor. This will give

you the number of feet N-S and E-W the two points are from each other.

Triangulation will then give you the straight line distance between

the points.

HTH

Charlie

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GRAVITY:

It's not just a good idea-IT'S THE LAW!