spodgaju
Does anyone know of any apps that on GrapheneOS that can share my location? I only needs to be one way.
Not sure: Would you like to share your location only when needed or permanently?
In the first case you can share your location via messenger without an additional app (i suppose most messenger apps support this feature nowadays and it works across different OS).
Using Signal for example tap "+" icon in chat dialog, then tap "location" and send your actual position.
In Molly, for example, two links are created: one for Open Street Maps and one for Google Maps. I can't say whether Apple Maps can process the links, but your friend can at least call up your location by browser or via Google Maps on his/her iPhone.
Some messenger apps even seem to give you an option to share your location permanently (or at least for a predefined period of time). In WhatsApp's it's called "Live Location":
Live Location allows you to share your real-time location with the members of an individual or group chat. You control whether and how long to share your live location. You can also stop sharing your live location at any time. Once stopped or expired, your live location will no longer be shared.
source: https://faq.whatsapp.com/480865177351335/
Note: I'm not a WhatsApp user so i can't tell anything about it firsthand.