Dear Chalie2,
Changi CLS have turn on the 25Hz In-Service Electroding Tone on TIS Segment 1 (SKL-CGS)
For civil engineering work (detection works on site for the purpose of Soil Investigation) by Contractor.
a. TIS Segment - 25th August 2015 (Land Detection) - 0005utc to 0900utc
b. TIS Segment - 28th August 2015 (Marine Detection) - 0005utc to 0900utc
For your info.
Thank you and Best Regards