clearTimeout and WARNING: Out of memory while appending to array

Hmm... You could try writing trace() which should dump any memory immediately accessible from root.

It's a really odd one because it looks like console.log is causing the error, but it really shouldn't allocate much memory.

The only thing I can think of is that the GPS module doesn't limit the amount of characters it stores in a line, so if you got a few thousand characters without a line break, that could cause a problem.