Just been looking at some of your earlier posts and it seems you've had some ongoing difficulty with getting your head around the different formats that are commonly used (in GPS receivers and elsewhere) for display of latitude and longitude. Just in case the earlier replies to this thread haven't fully explained it, I'm going to add some more information. Please excuse me if this is stuff you already understand!
First, this page
has some information about the basic of what latitude and longitude is all about.
Then you can find a bit more detail here
about different ways of writing latitude and longitudes (and how to convert between them if you want to do it the hard way).
The key point is that your latitude or longitude can be specified in a number of different ways (but all still pointing to the same place on the earth).
For example, 39.5° South is talking about being halfway between 39° South and 40° South. That is using the "decimal degrees" format which is likely to be shown on your GPS menu as something like "H D.D" (where H stands for "Hemisphere" (I think!) - i.e. N or S or E or W for North, South, East and West - and the D.D means that all the numbers are referring to degrees, including probably a decimal fraction of a degree (i.e. a part of degree given as digits after a decimal point).
Each degree can also be thought of instead as equivalent to 60 "minutes". In this case the 39.5° South could be written as 39° 30' South (where the ' symbol after the 30 means "minutes"). I.e. 39 degrees plus 30 minutes South of the equator. In this format the degrees will always be a whole number, and the minutes might have a fractional part also. For example, 39° 30.750' South means 39 degrees plus 30.750 minutes South. (This is the "standard format" for geocaching.com). On your GPS unit this display format appears as "H D M.M" or similar.
The third (and last) commonly used format is to use degrees, minutes *and* seconds. I.e. each latitude and longitude is given as three numbers, a whole "degree", a whole "minute", and then finally the "seconds" which in this case might also have a fractional part after a decimal point. In this format the 39° 30.750' South that I talked about in the previous paragraph would appear as 39° 30' 45.0" South. This means "39 degrees, 30 minutes, and 45.0 seconds south of the equator". This is the same as 39° 30.750' South because 3/4 of a minute (the .750 part) is the same as 45 seconds, because each "minute" is equivalent to 60 "seconds" (of arc). This last method of specifying your latitude and longitude is likely to appear on your GPS receiver menu as something like "H D M S.S".
As Kiwilegend noted, it helps if the correct punctuation is used to make it clear, by using a ° after the degrees part, a ' after the minutes part, and a " after the seconds. When these are not spelt out you can make an educated guess depending on the how the numbers are spaced out and if decimal points are present. If there are three distinct values given for each lat and long (probably separated by spaces or similar) then it is likely to be a position given in the full degreees, minutes and seconds format (H D M S.S). If there are just two numbers then it is likely to be the degrees and decimal minutes format (H D M.M) and if there is just one number (including probably a decimal place and extra digits after that) then it is probably a decimal degrees format (H D.D).
The format selected on your GPS receiver will determine how positions are displayed and also how you have to enter them. You can change between the different formats whenever you need to - just be sure you understand the differences! The reason you might find you cannot enter digits higher that 5 in some places is that you are putting a value into a minute or seconds field, and these can can't go past 60 (because 60 seconds is the same as one minute, and 60 minutes is the same as 1 degree).
Hope this helps. If it doesn't, well, just ignore everything I said! There is probably a much better description out there somewhere on the net but I couldn't find it!
Here endeth the lesson...