“Gulf of Trump” just go for the gusto you fucking spinless pussies.

☞ https://www.openstreetmap.org

https://f-droid.org/packages/app.organicmaps/ or https://github.com/organicmaps/organicmaps

Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by the community. No ads, no tracking, no data collection, no crapware. 

https://f-droid.org/packages/net.osmand.plus/ or https://github.com/osmandapp/Osmand

This project aims at providing comfortable map viewing and navigation (routing) application for mobile devices. Particular stress lies with complete offline features (via pre-loaded offline map data) or economic internet usage.

https://apt.izzysoft.de/fdroid/index/apk/akylas.alpi.maps or https://github.com/Akylas/alpimaps

Alpi Maps is a map application to help you prepare and enjoy your hike! Get all the info you need before you go, then enjoy all the data offline during your hike.