This thing about emergency services needing to know to the nearest metre or so
None of the response vehicles I operate, or any with which I am familiar (across several services) in the UK have the kind of kit with this accuracy fitted or manportable (along with all the other gubbins we have to carry when out of the vehicle) and kept in some kind of bracket.
If we get to a location, probably given as "a mile up the B2345, past the Three Kings Pub" then if we cannot find the incident we are looking for there, we night have a bit of a look around, perhaps peek over a hedge or two to see if someone's vehicle has jumped the verge and is resting in a field out of most people's line of sight. I might even, in an urban area, clamber up on to the odd garden wall (if not topped with cemented-in broken glass) and peer into someone's garden.
It seems that some commentards think that if the incident I am looking for is not within a metre of the location given, that I will not find it. Do they therefore also assume that if my satnav directs me to drive into a canal, that I might not pause and think "hang on a second, this vehicle is indeed a submersible, but only once"?