Curious if you are standing in your survey block? I made a quick Google Map of all the Priority Survey Blocks for the atlas. Just follow this link - Second Vermont Butterfly Atlas Priority Blocks - Google My Maps. I open it in Google Maps app on my iPhone and I can see the live dot where I am standing to make sure I am indeed in my block. Handy tool for some perhaps!
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I have been using the topo maps (remember those?) which were the block defining tool for the first butterfly (and bird) atlas projects. It is folded in half lengthwise and in thirds widthwide to form blocks 1-6. There is quite a decrepency between the topo map, the project Block Mapper Tool (linked from the website) and the Google Map. I have Dorset 5 Priority Block which is 95% forest. The minimal open meadows/farmland is on the north boundry. The north boundry on the other two digital maps are both different and reduce the field habitat. Which map do I use? Are the borders really that crutial? Butterflies don’t know which block to stay in to be counted!
The blocks are crucial. They are a statistical sample design. Both digital maps look exactly the same to me when I just examined them.