MapKit in Airplane Mode

I have 30 MKPinAnnotations on a map in my area. I also have a series of arrays of 30 more locations relative to each of those 30. The experience I want is to be able to tap one of those pins, and the other 30 relative pins show up around it. When I do everything with full internet connectivity, this is the result:

MKPinAnnotations

I am using Realm to cache everything on the backend, so I know I have the data available to me. Tapping the blue pin brings up a callout view that allows me to "check in" to this location, which should summon the 30 other relative locations. This is the code that drops my pins for me:

if let annotations = currentRestaurantAnnotations
mapView.removeAnnotations(annotations)

currentRestaurantAnnotations = nil
currentRestaurants = nil
var restaurantPins = [RestaurantAnnotation]()
for restaurant in restaurants.filter( $0.venueID == currentFocusVenue?.id )
let pin = RestaurantAnnotation(coordinate: CLLocationCoordinate2D(latitude: restaurant.latitude, longitude: restaurant.longitude), title: restaurant.name)
restaurantPins.append(pin)

currentRestaurantAnnotations = restaurantPins
mapView.showAnnotations(restaurantPins, animated: true)


Again, debugging on this when I have connectivity, all of the annotations make it to the last line. When I put the device in airplane mode, and I tap the blue pin and its callout button, this method gets triggered again, and everything runs in the code as it should, but after showAnnotations() runs, the map view shows no annotations.

showAnnotations()

For context, if I then take the device out of airplane mode, the app does what it should by triggering an update from the cloud of those 30 relative locations. This function to show the annotations is triggered again, and the annotations all show because my device is in airplane mode.

Tl;dr: how do I make annotations show up on MapKit when my device is in airplane mode?

MKPinAnnotation

showAnnotations

addAnnotations

setVisibleMapRect

showAnnotations

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