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To notify dispatch of coordinates for an LZ, tell the dispatcher:
"We are setting up an LZ at "(name of LZ)"
GPS coordinates for as follows:
40.559 Say "Forty POINT FIVE-FIVE-NINER North"
75.122 Say "Seventy-Five POINT One-Two-Two West"
Listen for dispatcher readback and confirm accurate information.
Rather than "Forty" which can be heard as "Fourteen" and "Seventy" being heard as "Seventeen", I'd recommend saying "Four-Zero decimal Five-Five-Niner North", and in the same format I'd recommend, "Seven-Five Decimal One-Two-Two West". Putting it in context, "Fourteen" and "Seventeen" may not make much sense, but break it all down so there's no confusion.