Thank you very much for the great info! (I was following a tutorial and some advice posted here.)
Per the advice, I went to the Garmin website and downladed & installed BaseCamp (which did come with MapInstall), then using BaseCamp's help menu installed the 24K maps for parts of 3 states. I can now see the topo maps.
(BTW, There is no hint you need these programs in either the 450's Quickstart Manual, the 46-page Main Manual, or the Garmin 24 K Map DVD.
Or any tutorials... What's up with that?
)
Per the advice, I went to the Garmin website and downladed & installed BaseCamp (which did come with MapInstall), then using BaseCamp's help menu installed the 24K maps for parts of 3 states. I can now see the topo maps.

(BTW, There is no hint you need these programs in either the 450's Quickstart Manual, the 46-page Main Manual, or the Garmin 24 K Map DVD.

