Here are 8 mobile apps that are essential when traveling. 
1. for offline maps


2. Xe for money exchange converter


3. Trip Advisor for restaurant and activities advice

4. TKTS: Save up to 70% on broadway shows.

5. Google Trips to keep your travel confirmation documents in one place


6. Transit - New-York for subway and bus information

7. Open Table for restaurants

8. Google Translate to translate languages