Jeff Arnold

蓝宝石案Lan Bao Shi An The Adventure of the Blue Carbuncle The classic Sherlock Holmes tale, written in simple language for people learning Mandarin, Piny …

This is the full version of sailing buoys.The full version is available from android market and contains a full set of questions.This is a fun app to …

This is the full version of sailing light signals.This is a fun app to help learn the common light signals used during sailing.The signals are based o …

A fun little app with lots of questions including history, science, arts, famous people, quotes from texts, literature and so on.免費玩Quiz 1 General Kno …

Navigational Aid For Visually Impaired PeopleOn Track is a app which will talk to any built in compass and convert heading / course information into a …

The 2nd in the series of fun apps with lots of new questions including history, science, arts, famous people, quotes from texts, literature and so on. …

The 3rd in the general knowledge series of brain teasers.With more than 100 questions this quiz is more international than the previous two and has a …

This is the full version of sailing sound signals.This is a fun app to help learn the common sound signals used during sailing.The signals are based o …