Thanks for your quick response.
The location of the things (Pharmacy data type) remains the same. However, every time the RG loads, the distance between the Pharmacy and the current user’s location (which changes) has to be calculated and displayed.
My goal is to display that distance in each cell of the RG and sort it by that same distance (closest to furthest).
e.g. Pharmacy A - - - 1.5KM
Pharmacy B - - - 2.3KM
To get the user’s location I used the Toolbox plugin JavascriptToBubble element (with an HTML5 geolocation script) and used the Expression element to compute and display the straight-line distance in the RG cells.
I’d like to avoid creating a distance field that would have to be constantly updated for so many rows.