For current cordinate we have to add a button resetting the product's coordinates to the location of the user, you can get these coordinates using the javascript geolocation API.
Now we would like to display an additional button to automatically set the coordinates to the location of the current user.For example code is like below.

local.WidgetCoordinates = instance.web.form.FormWidget.extend({
    events: {
        'click button': function () {
            navigator.geolocation.getCurrentPosition(
                this.proxy('received_position'));
        }
    },
    start: function() {
        var sup = this._super();
        this.field_manager.on("field_changed:provider_latitude", this, this.display_map);
        this.field_manager.on("field_changed:provider_longitude", this, this.display_map);
        this.on("change:effective_readonly", this, this.display_map);
        this.display_map();
        return sup;
    },
    display_map: function() {
        this.$el.html(QWeb.render("WidgetCoordinates", {
            "latitude": this.field_manager.get_field_value("provider_latitude") || 0,
            "longitude": this.field_manager.get_field_value("provider_longitude") || 0,
        }));
        this.$("button").toggle(! this.get("effective_readonly"));
    },
    received_position: function(obj) {
        this.field_manager.set_values({
            "provider_latitude": obj.coords.latitude,
            "provider_longitude": obj.coords.longitude,
        });
    },
});

Note- user should not be able to click on that button when the form view is in read-only mode.