# Dutchman's Log

> Dutchman's Log (iPhone/iPad app by Colin Porteous.)

- Source: https://appshunter.io/ios/app/dutchmans-log/id474782184 (this page in markdown: same URL + `.md`)
- Developer: [Colin Porteous](https://appshunter.io/developer/355517263)
- Category: Navigation, Utilities
- Price: $2.99
- Age rating: 4+
- Requires: iOS 18.1 · 1 MB
- Languages: English
- Released: 2011-11-08
- Data updated: 2026-07-16
- User reviews in markdown: https://appshunter.io/ios/app/dutchmans-log/id474782184/reviews.md

## What is Dutchman's Log?

Utility to measure your boat speed over the water. Can also be used to calibrate or to check accuracy of your speed/log device.

A boat's speed may be estimated by timing how long the boat takes to pass a floating object.
The boat length and desired units must be entered in 'Settings'
Two persons are needed, one stands on the bow and the other aft.
The person on the bow throws an object that will float (crumpled piece of paper) into the water, ahead and to one side of the bow.
As it passes the bow at right angles, they shout 'Now', and the person on the stern taps the 'start timing' button.
When the object passes the stern at right angles, the 'stop timing' button is tapped.
The App now calculates and displays the boat speed.

Units in Knots, metres/second or Kilometres/hour


## Version history (last 5 releases)

### 2.0 — 2026-06-11

Improved performance
Updated user interface

### 1.92 — 2024-10-28

Updated for iOS 18

### 1.91 — 2021-09-30

Updated for iOS15

### 1.9 — 2021-02-09

Updated for iOS14

### 1.8 — 2019-11-03

Updated for iOS13 and Dark mode

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## More apps by Colin Porteous

- [E6b Pilot](https://appshunter.io/ios/app/e6b-pilot/id368495864)
- [iPlotter Solent](https://appshunter.io/ios/app/iplotter-solent/id397677340)
- [iHeatLoss](https://appshunter.io/ios/app/iheatloss/id680564773)
- [Easter Match Puzzle](https://appshunter.io/ios/app/easter-match-puzzle/id836681161)
- [iStreams Channel Islands](https://appshunter.io/ios/app/istreams-channel-islands/id1223503159)

All apps by Colin Porteous: https://appshunter.io/developer/355517263

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-16.*