A helicopter-borne transient electromagnetic (HTEM) survey system is being designed with characteristics suitable to map glaciolacustrine overburden overlying Precambrian bedrock for the purpose of correcting airborne gravity measurements for lateral variations in overburden thickness. The HTEM system parameters such as transmitter power and waveform are optimized for overburden mapping, by using forward modelling and inversion. This paper will discuss some inversion results that test the capability of the system at resolving the thickness of an overburden under multi-layer geological scenarios.