LOCATION:

For the purposes of amphibious travel within the Caribbean Islands, the only suitable location to travel from is the Scrub Island Resort (BVI) in British Virgin Islands as shown in the maps below,

As can be seen above there is a narrow river-like crossing from the resort to the island across, this is a very ideal location for a convenient amphibious vehicle operation as there are frequent tourist visits as well as the local population.

The distance our amphibious vehicle would have to travel from one port to another is approximately 260m.

WEATHER:

The Climate Guide for Scrub Island shows the historical weather averages for each month of year. The guide shows maximum and minimum temperatures, monthly rainfall, hours of sunshine and daylight and levels of UV:

(Source: http://www.weather2stay.com/hotelweather/british-virgin-islands/scrub-island/scrub-island.php#moreinfo)

A complete analysis of the Scrub Island, the weather, tides, wind, UV, Sun, and Moon:

(source: http://www.willyweather.com/me/washington-county/scrub-island.html)

Here is a more recent weather forecast analysed on 22nd August 2015:

(Source: http://www.weather.com/weather/tenday/l/Road+Town+British+Virgin+Islands+VIXX0001:1:VI)

LAND:

The soil on the islands is poor, consisting mostly of brown loam of volcanic origin. The British Virgin Islands' climate is tropical with a pronounced rainy season from May through November. The rain falls in short, heavy showers and averages about 125 centimetres per year. Despite the moderate rainfall, porous soils and high evaporation rates allow for only xerophytic types of vegetation, that is, plants that survive in dry, hot climates. Temperatures are fairly constant, ranging from summer maximums of 31°C to winter minimums of 20°C. Trade winds are constant, blowing from the northeast in winter and from the southeast in summer. Hurricanes strike occasionally from June to November.