does anyone know how to convert gps marks with 2 numbers after the decimal into 3. For example 23 17.81 151 17.83 I have heard that putting a zero on the end works but found out that thats not correct. Any help would be great.
cheers
does anyone know how to convert gps marks with 2 numbers after the decimal into 3. For example 23 17.81 151 17.83 I have heard that putting a zero on the end works but found out that thats not correct. Any help would be great.
cheers
The 3rd digit is a degree of accuracy for that mark. Presumably your marks have been rounded up or down to 2 decimal digits. Only real way to refine these is to go to the mark and sound around until you find what it was and save the new reading as 3 or 4 decimal places depending on your machine. Adding a zero does nothing to refine your mark.
Jack.
I figure u just typed any numbers in for example, but all numbers (other than the first) cant me over 60.
say from 27 50 25 to 27 50 26 is less than 30m so the difference isnt that great
G'day,Originally Posted by boony83
OK, adding a zero might not be absolutely correct, but it will work if your GPS requires 3 decimal places. We are only talking about a few metres with the 3rd decimal place. You could hedge your bet and add a 5 instead of 0, you should be close enough to sound around and find the spot, then re-enter the 3rd or 4th decimal places.
there's different ways you'll see notations for Lat/Long positions written.
e.g. 23 17.81 & 151 17.83 translates to 23 degrees 17.81 minutes (assume South) & 151 degrees 17.83 minutes (assume East).
1 minute = 1852 metres
1st decimal place = 1851.9m - 185.2m
2nd decimal place = 185.19m - 18.52m
3rd decimal place = 18.519m - 1.852m
converted to degrees, minutes and seconds those positons are:
23 17' 48.6" S - 23 degrees 17 minutes 48.6 seconds S.
151 17' 49.8" E - 151 degrees 17 minutes 49.8 seconds E.
"but all numbers (other than the first) cant me over 60."
1. That statement is only correct if the format is Deg Min Sec as Deg Min. Decimal Min can certainly be greater than 60. Even 27° 50.999' is valid, similar 27° 50.99999' as is 27° 50.9' or 27° 50.900'
"For example 23 17.81 151 17.83 I have heard that putting a zero on the end works but found out that thats not correct."
2. 23 17.810 151 17.830 is what you would use if requiring a 3 decimal minute type format
3. Realtive to "valid" position to 3 decimal points the 2 decimal points + zero added mark "should" be within about 26 metres (about 85 feet)
thanks for everyones input. since I am only new on here it is amazing how helpful everyone can be. So you think that if i go out with the mark that i got it sould be within 30 or 40 meters if i add a zero to the end and then should be able to sound back and forth and find it???
boony, if you have a plotter, zoom it right in, set track function & start a box search around your mark.
ROLL TIDE, ROLL.................
Regards,
Peter
"So you think that if i go out with the mark that i got it sould be within 30 or 40 meters if i add a zero to the end"
1. Within 30 or 40 metres ?? Yes less than that IF you also know for sure what the datum of your mark is.
2. The zero is really insignificant as long as you know the datum otherwise your search area could be a few hundred metres +
cheers boys. i just need some good weather to get out there and give it a go......
F*** the wind
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