# Distances & Tonmiles Methodology

## Distances & Tonmiles Methodology

Voyage distances in the Oceanbolt platform are calculated in two ways:

**Calculated Distance**- measuring the shortest distance port-to-port of the voyage route**Actual Distance**- measuring the length of the AIS track for the duration of the voyage

These two distance measures form the basis for tonmile calculations and provide the basis for *Calculated Tonmiles* (i.e. using the Calculated Distance) and *Actual Tonmiles* (i.e. using the Actual Distance).

### Tondays formula

In addition to Tonmiles, Oceanbolt also provides Tondays, which you can refer to as “volume x duration”. The Tondays are calculated as **volume x total duration of the voyage [in days]**.

### Tonmiles for Parceling Voyages

For parceling voyages, Oceanbolt uses the following logic for tonmiles.

Take an example of a voyage with a load event in Australia (specifically, Iron Ore in Port Hedland) and two discharge events (First to Caofeidian, China, and then to Incheon, Korea).

This voyage will generate two cargo flows:

Flow 1: Iron ore, Port Hedland -> Caofeidian

Flow 2: Iron ore, Port Hedland -> Incheon

For calculated tonmiles the distances that are used are:

The shortest route from Port Hedland to Caofeidian for Flow 1

The shortest route from Port Hedland to Incheon for Flow 2

For actual tonmiles the distances that are used are:

The length of the AIS track from Port Hedland to Caofeidian for Flow 1

The length of the AIS track Port Hedland to Caofeidian and then to Incheon for Flow 2