Q88/Q88 Onboard - Distance Calculator
You can easily calculate the distance between ports by navigating to Tools → Distance Calculator.

Tools → Distance Calculator under the top bar menu
A new tab will open in your browser, allowing you to add data into the specific fields. Please note that all fields are editable. You can also add additional legs to calculate the distance and estimated time of arrival (ETA).
https://vm.q88.com/VM/Voyage/DistanceCalculator

Add/Edit data to calculate the distance, ETA between ports
You can choose and modify the root by expanding the option on the Map.
Set the Route Via:
Panama Canal ...
Suez Canal ...
Magellan ...
North of Scotland ...
Sound (Baltic)
and many more Canals/ Capes/ Passages or Straits
Set Options from:
Anti-Piracy routing ...
ASL Compliance ...
Env/Nav/Reg Routing