Contour map updating

[h_useynu]

Is there a way to update contour lines in TZT3 using PBG by use of 1kw inhull M265LH transducer instead of buying dedicated box and transducer for PBG? I would like to get updated contour lines for the areas that I would have scanned while out fishing.

 

[hiccup]

While other brands allow this feature, Furuno does not. It'd be a nice feature to have.