I'm running Tomb of Annihilation as a first-time DM and I don't know how to handle the map that their patron gave to the party. Only parts of this maps are already filled in, but this does means that for the first chunk of the adventure, the party is within filled-in territory. I plan on filling in the map as they go along (one of the players has navigators tools and another is an Outlander) but I think I might run into a problem:
On a daily basis someone has to make a Survival check which prevents the party from getting lost. Mechanically, the book says nothing about if having the map - specifically being in the filled-in areas of it - does anything to these checks. No advantage, no lowering of DC, nothing. I'm almost certain that my players are going to bring this up and I don't know exactly how to handle it.
The party consists of a druid, a sorcerer, a barbarian and a cleric - who will most likely be doing the check due to his high Survival. They also have a guide who might be able to give them advantage on the Survival check.
Mainly, I'm worried about making navigation either too challenging or not challenging enough. If I give out advantage for the navigation check every time then it feels like a needless roll, if I don't then I'm worried my players will get annoyed by the map or guide not being useful.