Hi Kevin,
Here are some notes concerning the program and test files:

Program: testrwmkevin.for

Files:

k63940760.dat file, input file to this program
 
is the original kriged data file (indicated by the k
it is an unformatted direct access file.  the first record the only piece
of information is in the 4th column, and it has the number of total records
in the file, +1, to count record one, we always read that first to add
go directly to the next record to add data
ex: if there are 74 real records in file, that number would be 75, therefore
the first record we would write would be rec#76.

63940760.asc Is a formatted ascii output file, to see the actual contents of 
	     the file

63940760.dat file, is the same original file, written by this program to show 
how to write it.

Columns are:

col 1: time: Julian day since Jan 1, 1979 = day 1,
       14064.00000 = 7   3.0000 2017= July 3, 2017, last date of update

col 2: lat, 
col 3: lon,
col 4: sst(deg C)
col 5: ve (cm/sec)
col 6: vn (cm/sec)
col 7: speed (cm/sec)
col 8: error lat (how far apart is the interpolated value from the observed)
col 9: error lon
col 10: error sst

Please let me know if you have any questions,
Best,
Mayra