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We only want to show the location if the geolocating is fairly accurate
Should we only enable this on handheld devices? (desktop geolocating is often very approximate anway)
Getting the position is typically a two-step process: An approximate reading is quick (that's what we use now, on loading the map), then it can take seconds (or minutes in extreme cases) to get a more exact reading. This means that re-centering the map on the second reading is potentially disruptive. My suggestion: Only show the user's location if geolocating is manually triggered. The icon could even be used to toggle geolocation polling.
Constantly polling for a position is battery intensive, and another reason to make it possible to toggle this behaviour.
Using a shaded circle that indicates the exactness could be useful, and also make the re-adjusting of the map more transparent and less disruptive. (Like we did on the old version of Fruktkartan)
Should we indicate direction?
While the geolocation api is straightforward enough, there are a lot of different ways clients handle permissions etc, making it a bit hard to interpret all the possible error messages when a request times out, etc. TL;DR: If we want a Google Maps like functionality, actually being able to follow the user around, implementation will get more complex if we want to get everything right. Might be worth looking for a library/Leaflet plugin to handle this for us?
When using the map in the field, it's useful for many users to show the user's current location on the map (you know with a blue dot or similar).
Nice job on the service and the site.
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