I just wrote 3 Automator services on my mac that help me with the debugging of DNA modification scripts I've been writing. Of course, there are other ways to do it. I kinda just did it for fun, really.
Briefly, these services allow you to see where a coordinate is in a sequence or obtain the (sequence and alignment) length of a selected sequence (along with an NT breakdown).
Let me know if you like them or find them useful - or how you deal with finding coordinates in text in random apps.
If you'd like step-by-step instructions on usage & installation, or have any trouble or unexpected behavior, more details can be found in my blog post: Automator Services for finding coordinates in DNA/AA strings.
Here's a direct link to the code: