Hi Mark
Yes, if you have created the Submit Sightings page using Instant Indicia (or the MNHNL Dynamic 1 form which is the form used by Instant Indicia), then click on the Edit tab when viewing the form. Now, look down the page for a section called User Interface. In this section there is a box called Form Structure which lets you flexibly define how the form will be output.

Look through the content of this box for the line which reads [spatial reference] - that's the spatial reference control. You can put overrides to the default behaviour on subsequent lines, so to change the label you could add something like @label=Grid ref. Do the same for the [place search] to change its label. Your code should now look something like:

...
[spatial reference]
@label=Grid ref.
[place search]
@label=Search map
...

Now just save the form and the labels should be updated as appropriate.

You'll note in the comments under the Form Structure text area it says "The options available depend on the control." There are a range of options for advanced users which are best documented in the code at present.

A couple of interest to Mark for the [map] control are clickedSrefPrecisionMin and clickedSrefPrecisionMax. These allow you to specify the minimum and maximum precision allowed when clicking on the map to get a grid square. If not set then the grid square selected will decrease to its minimum size as the map is zoomed in. With the Ordnance Survey grid, values of 2, 4, 6, 8 or 10 signify squares of 10km, 1km, 100m, 10m and 1m respectively.

Jim Bacon

Hi

These are options that you can specify in the Form Structure text area when you are editing the Drupal page in exactly the same way that John described the label option.

To force all grid references to be 6 figure precision (i.e. 100m square) you would have the following:

...
[map]
@clickedSrefPrecisionMin=6
@clickedSrefPrecisionMax=6
...

This does not impose any restriction on the way the user zooms in so they could click on a map that is zoomed out a long way and they will mark a point but it will be so small they won't even know they have done it.

I could easily amend the code so that an alert appeared saying "You must zoom in before recording your location" to counter this problem.

Jim Bacon

Hi Mark
It's not something I have done for this purpose, but you can supply configuration options to the OpenLayers map in the Advanced Base Layers section of the form editor. With some experimentation and a bit of luck it should be possible to supply a configuration to limit the number of zoom levels available on the map. Whether this helps or not I am not sure, because users will probably want to start zoomed out and then zoom in to their area of interest.
Another thought, also something that would take a bit of fiddling to get right - you can attach your own Javascript to the form by creating a file called node.n.js in the iform module's client_helpers/prebuilt_forms/js folder. If you create a function and push it onto the mapInitialisationHooks array, this function will be called with the mapDiv as a parameter when the map is initialised. Then you can attach a zoomend event handler to the map. When the event is called, check the map scale and if it is inappropriate replace the spatial ref box with a label "Please zoom in before clicking to set the grid reference" or similar.

See http://code.google.com/p/indicia/wiki/DrupalIFormOverrides for how to add custom JS to the form.