Yes. His macro was made to be used with GSAK. Go to this thread and read up on it.
http://forums.Groundspeak.com/GC/index.php?showtopic=193374
He has a link to his download/instruction page to walk you through it.
GSAK has been a hurdle for me, but I did manage to figure out how to make both work using Pilotsnipe's information. GSAK is a free download, but after a few weeks you get a Nag screen which increasingly delays usage. That's fair, you can tell the GSAK man put a lot of work into it and is seeking compensation.
I use Easy GPS to load basic (coords, name, owner, etc.) information into my handheld and full cache descriptions into the Nuvi using the GSAK?Pilotsnipes deal. The Nuvi autoroutes me close and I use the handheld to finish. Sometimes the Nuvi can be used solo. Mine is a Nuvi 200 and doesn't have the some of the abilities that the more costly units have, but I'm quite pleased with it.
great. Thanks for the help