ex:latlng = {expression}

Specifies latitude and longitude (separated by a comma) from a single property of an item.

 ex:proxy = {expression}

Refers to an item from which to resolve the ex:lat and ex:lng properties, by default the current item. Usually not needed (more detailed explanation).

 ex:lat = {expression}
 ex:lng = {expression}

Specifies latitude and longitude as individual properties of an item. May need ex:proxy for multi-hop expressions.

 ex:marker = {expression}
 
 ex:center = {lat/lng pair separated by comma}
 ex:zoom = {zoom level as number, specified by Google Maps}
 ex:size = "small" | "large" (picks GSmallMapControl or GLargeMapControl)
 ex:scaleControl = "true" | "false"
 ex:type = "normal" | "satellite" | "hybrid"