This is nice, since it lets you load USGS 24k maps for the whole state, unlike the "custom maps" that I've posted that are limited to about 20x20 miles. Separate subscription from the aerial imagery though, so you need to spend $30.
https://buy.garmin.com/shop/shop.do?cID=255&pID=98816
BirdsEye™ TOPO, U.S. and Canada
$ 29.99 USD
Downloadable
- Provides highly detailed 1:24,000* scale raster USGS maps and 1:50,000 scale raster NRC maps.
- Features an unlimited amount of downloadable raster maps for 1 year using BaseCamp software.
- Allows users to layer Garmin vector maps (such as TOPO 100K, TOPO 24K or City Navigator®) on their handheld for a real-life view of roads, buildings and terrain.
https://buy.garmin.com/shop/shop.do?cID=255&pID=98816