Have been using Pat's (Radarspotter10) greenish colour scheme [Newcolor1.mcl file] for the past week with great success.
However, this evening, whilst tracking 9V-SKC (Singapore A380) heading across the English Channel into LHR, I found a strange darker blue band. As shown in attached screen shot.
Actually prefer this darker blue to the general lighter blue, but any explanation for this band of darker colour - certainly not related to ocean depths.