I run a Garmin 162 on my boat and it has "decent". I have several friends who run the high end Garmin color GPS units, 2006-C and 2010-C. The capabilities of these units, when coupled with the Garmin Map Source (Blue Chart) software, is simply unbeliveable. The 2010-C runs around $2500 and the 2006-C is around $2000. Both machines are produced in a grayscale version for considerably less. The Map Source CD is about $125. I got my 162 for about $350.