This looks like a Vigenère square code with SOLVE as the key word.
It appears that upper/lower case is irrelevant
Write SOLVE repeatedly under the cipher text and look up the plaintext result from the square. For example
ZHHCnyKJHqBLDIEzKt..
SOLVESOLVESOLVESOL.. yields;
THETRUECOORDINATES...
So the message starts The true co-ordinates are...
Vigenère
Hi Red - When I saw the list of digraphs with no double letters I thought that this was a Playfair code but these are usually coded with a key that has no repeated letters. If you ignore the second Z however and use PUZLE as the key then it works and makes the Playfair square;
PUZLE
ABCDF
GHJKM
NOQRS
TVWXY
J stands for both I and J in this code.
So
vo oq oq pg oq vg ls translates as
oh no no ta no th er
So the message begins Oh no not another....
I'll let you do the rest. If you're not familiar with Playfair it's easy to Google.
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Do you know the answer?
Does anyone know what type of code this is as I am trying to decode and am stuck?