Triskaidekaphilia #13: Don't be so square. Traditional Cache
poseidonium: Went to check for maintenance.
Seems that GC has disappeared.
The GZ might be compromised.
Will not be replacing.
Triskaidekaphilia #13: Don't be so square.
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Difficulty:
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Terrain:
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Size: 
(other)
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This is now a traditional cache.
While the coords are enough, the clues (below) are hidden in puzzle form.
The cache is a magnetic nano hidden along a tributary to the largest storm canal in Singapore. Along duchess road, a very quiet and conducive place to go for an evening jog. This is an affluent neighbourhood hosting many of the top schools in the country.
Cacher: Long time no see!
Me: Hi.
Cacher: So, where is the next Triskaidekaphilia cache?
Me: This one.
Cahcer: Where is it?
Me: Read the title.
13 minutes later:
Cacher: More info?
Me: You guys told me tl;dr. So I'm keeping it simple.
Cacher: What square are we talking about?
Me: Read the title.
Cacher: Square shaped? Square of a number? or is it useless.
Me: Read the title and guess.
13hours later:
Cacher: I couldn't find it!
Me: Let's say this square need to be converted to base 21.
Cacher: OMG!
13days later:
Cacher: Still can't find it! More clues, please?
Me: Park at red 5593, and go along the back.
Cacher: Thanks.
Additional Hints
(Decrypt)
Lbh ner ybbxvat sbe n zntargvp zvpeb.