So I was reviewing the runway layout at Guatemala city today and was confused about something.

I know all about displaced runway thresholds from FAA/JAA/ICAO literature. However, I have not found ANY mention about yellow arrows used in lieu for white arrows. Clearly this is not a chevron; nor is it a "temporary" threshold displacement.

Anyone have any information or reference as to why this is used? Yellow paint cheaper than white??

On a side note, if you look at the DCA 10-9 Jepp chart, the Clearance frequency shows a (Cpt) 128.25. What does the (Cpt) represent or refer to?

Thanks in advance to those who provide a thoughtful or intelligent response.

I have attached a picture in an attempt to clarify what I'm asking for in GUA but could not find a 10-9 DCA Jepp online.