HELP!

I'm less than a day away from picking up the RV and heading out to the Playa -- alas, I am still without maps, despite the EXCELLENT information provided at the link above.

Here's my problem:

I can't seem to get the provided .img files pushed to my Garmin 60CSx. Because of the large number and type of maps I typically have loaded on my GPSr, the optimal solution (for me) would be to get them into a format that MapSource understands, so that I could manage it the same as all my other map datum: US Topo, City Select, 24K National Park topos, tidal data. At any given time, I may have a (large) collection mix-and-matched of these various maps. Following several links from this URL, I found a hint that this might be possible - with a suggestion that I try googling it.

That led me to this page:

vip.hex.net/~dougs/GPSSM/index.html

Which suggests a program that would accomplish EXACTLY what I want - adding these maps to Mapsource for selection and inclusion. Unfortunately - when I download and attempt to run the program, I just get errors at every turn. There's no clear "source" of this program, though I have sent a "bug report" via the provided channel.

So - okay, I'm over it. In order to get these maps loaded, I was prepared to go the "sendmap" route, and either A) live with just the Playa maps/waypoints, or B) manually locate and select the 100+ Topo and City Select maps I want loaded for the trip. So I download the latest sendmap from here:

cgpsmapper.com/

I install it, fire up sendmap, and...

DOH! It appears to only support COM port communications to the GPS receiver - not USB.

So, I beg of my fellow geo-burners not already on the playa (or there, with 'net access ;-):

Does anyone know a working process to get these .IMG maps onto a usb-interface Garmin GPS receiver?

I'm itching to have these maps, and would hate to have to settle for the just the intersection/art location waypoints (though I'm grateful for those, TOO!!)

So close, yet...

Any help is MUCH appreciated,
Billy