The only way to take the gate map with you offline is to download the existing gate data into your inbox in the Survey123 app. See ‘Can I update an existing gate?’ for more details.
Once you have the data in you inbox you can browse this data by clicking on the Inbox. You can view it in a List or Map format. In Map format you can use the ‘My Location’ widget to locate gates near you. The map will not contain photos and the map will not show whether gates are open or closed until you click on the location of a gate to inspect the data.