Need help in correcting issues in CRC-ITU check method written in Javascript (node.js)

Question

We are trying to code GPS device listener on Javascript.

While doing this, we are unable to develop the right script for the CRC-ITU error check. The explanation for

Answer 1

Found very few links on CRC 16 calculation but found the current answer in javascript helpful.

In case anyone is looking for the same CRC 16 calculation using python, have created the public gist along with working python fiddle example:

https://gist.github.com/mrudang-vora/6a0767be085a275c0df3

Hope it helps someone.