My first thought was that opening a browser on a cell phone, then selecting options to allow a web site to access location data, seems a bit much to expect someone to do in a distress situation.
On the other hand, for a boater who only has (or only knows how to use) a cell phone, and has no clue about latitude or longitude, it may be ideal. Likewise for the CG communication watchstander, who is likely to be of the native cell phone generation.
From my experience, the watchstanders tend to keep asking for information which has already been passed. Maybe they missed it the first time because they were on a different line on the checklist, or maybe the case has been passed along to a central station or a different watchstander. Not sure why but it's pretty frustrating when you're trying to deal with an emergency
situation and keep being asked the same questions. So anything which can get the information down without additional VHF
traffic is probably a good thing.