GHowl 'Squished' Geo-XYZ

Hey all,

I have a problem with the GHowl ad-on, in particular its GEO->XYZ component. 

I'm tracking my path with my phone and converting the longitude, latitude and altitude from a CSV file into x/y/z points. However my results are coming out 'squished' in the y axis and I'm struggling to see why.. 

I imagine the problem is in the points I've chosen for the P1/2_XYZ but - although probably not best practice - I've just taken the lat and long points and plugged them in and scaled up the resulting curve..

Attached is what it should be:

And whats coming out:

Any ideas would be much appreciated.. Thank you!!