Many authorities on the subject warn against using W3W for safety-critical applications.[0][1][2]

Personally I could imagine that Maidenhead Locator System[3] may be more useful. It's just 4-12 chars (depending on what degree of accuracy you need)

[0] https://www.summerlandreview.com/news/bc-search-and-rescue-g...

[1] https://globalnews.ca/news/8258671/north-shore-rescue-what3w...

[2] https://www.squamishchief.com/local-news/squamish-search-and...

[3] https://en.wikipedia.org/wiki/Maidenhead_Locator_System