I started drafting a code according to your specification as a programming exercise, but in doing so I discovered a few pecularities regarding your specification:

1. (How) does your specification accomodate for varying coordinates?

It is impossible to determine the magnitude of the original coordinate and artificial granularity may be introduced if only the first 8 digits are used:

10000001 # 100.00001
99999999 #  99.999999
10000001 #  10.000001
99999999 #   9.9999999
10000001 #   1.0000001
99999999 #   0.99999999
10000001 #   0.10000001
99999999 #   0.099999999
...
[download]

A fixed reference is necessary to determine the respective magnitude:

10000001 # 100.00001
09999999 #  99.999999
01000000 #  10.000001
00999999 #   9.9999999
00100000 #   1.0000001
00099999 #   0.99999999
00010000 #   0.10000001
00009999 #   0.099999999
...
[download]

2. Should coordinates be truncated or rounded?

   Given a coordinate like 256.123456, the difference between 256.12346 and 256.12345 could be significant, but I guess that depends on the size of the planet in question.

3. What is the significance of the first two fields of the specification?

   Do they correspond to what I presume to be "device numbers" (or similar) in the log, eg: Generic Scanner PN Measurement DtiC(0)? If so, is there a particular order in the syntax (eg arbitrarily stipulated, alphabetical)?