I called Garmin last Friday but Gar was lost due to the snpow storm.

Speaking with Gar this morning, Background said I should be more precise plotting routes with Gar's software re the sandbar.

Which is true. Gar Homeport/Bluecharts SD brought us within 2oo feet of an interesting cut thru the sandbar. Very accurate !

However, my concept of actually where I was qualitatively was very narrow until I watched from above with Google Earth.