Here's what other sites are saying:
The Garmin TOPO U.S. 24K microSD data card lets you add richly detailed topographic maps of the Great Lakes region to your Garmin GPS receiver.
Garmin's new TOPO U.S. 24K gives you the highest level of topographic detail available. They have taken 24K topo data for the U.S. and have made regionalized coverage available on DVD or preprogrammed microSD cards with SD adapter. These new TOPO U.S. 24K regions will help ensure you're ready for your next backpacking, hiking or camping adventure.
- Mountains Plus
Garmin Topo US Central Plains 24K microSD
Garmin Topo US Northern Plains 24K microSD
National Geographic TOPO! Minnesota & Iowa CD-ROM
National Geographic TOPO! Kansas & Nebraska CD-ROM
National Geographic TOPO! Missouri, Oklahoma & Arkansas CD-ROM
National Geographic TOPO! Michigan, Ohio & Indiana CD-ROM
National Geographic Theodore Roosevelt National Park Explorer 3D CD-ROM
Lowrance Endura Topo Map microSD - Great Lakes