The last document you obtain as part of the formalities of leaving a country is a Zarpe. In the context of maritime navigation, “Zarpe” refers to the official clearance document needed to leave a country by boat. It’s a Spanish term that translates to “set sail” and is commonly used in the boating community. In some countries, obtaining a Zarpe is a requirement for legally leaving, and it’s often a document that needs to be presented upon departure from a port. As important, it is a document that is expected at your destination. I have obtained only one so far, when I left Mexico. I described the ordeal in a blog post. I am about to leave French Polynesia and I am working on getting my second. To obtain the Zarpe, I have to know where I am going. So, all day I have been giving that issue some thought.
To keep to my schedule, which is necessary if I am going to be in position to transit the Indian Ocean this season, I have to sail about as many days as I am at anchor. However, the number of days I am at anchor can be out of my control. For example, I have a punch list of things I need to do before I leave Tahiti that incudes a half dozen boat repairs. However, another time sink are the formalities … the paperwork. For example, It takes a minimum of one day to check into Tahiti and a minimum of three days to check out. Which brings me back to the issue of my next destination.
I published a proposed route last year. To help me decide my route going forward, I explored two issues: 1) how long does it take to get there and 2) how complicated are the formalities. Starting with the the time it takes to get places, I calculated the distances between destinations I am considering and created a spreadsheet. Calculating the distance between two points on a sphere is not simple. For that, we turn to Haversines Formula, where the Earth is approximated as a sphere. I used Excel to do the calculation, first by entering the latitudes and longitudes for the locations (using conventional signs for N/S and E/W), converted the degrees to radians, then transposed the matrix:

Note I have chosen to use the radius of the earth in nautical miles (3444 nm). Next I created the equation for the Haversine Formula in cell A15:
=ACOS(SIN($D7)SIN(G$4)+COS($D7)COS(G$4)COS(G$5-$E7))$B$1
Finally, I copied the equation into a 7×7 matrix, which was then automatically populated with the distances between the seven locations under consideration:

Using these data, I could compute the distance I would sail for various routes. If I assume an average 4 kt speed, I can then estimate the time I would be sailing. If I assume I’d spend about a week at each location, then I could estimate the time on land for each of the routes. The sum of these two would represent the total time. The difference between the total times for each route would be the time saved.

The first thing you notice is there is a difference between the first two distances (about 2700 nm) and the next three (about 2500 nm). The reason is the Cook Islands and Samoa are about 13 degrees S and Tahiti, Tonga, Fiji, and Vanuatu are about 16 degrees S. Going N 3 degrees and then ack S again (6 degrees total, about 360 nm) costs half a week in sailing. Second, you can save as much as a month by not making extra stops.
Of course, time is not everything. These locations are paradises. But, I would rather spend three weeks at one paradise than rush from one to the next. After reading about the Cook Islands (and hearing from a friend who is there now), it sounds like the formalities are a hassle. Samoa also has a reputation for a lot of paperwork. On the other hand Tonga is supposed to be very inviting and I am very much attracted to the 170 islands that make up Tonga. Visibility is supposed to be 100′ in the water. I would certainly save 2 1/2 weeks going there directly, and probably more realistically a month. Further, Tahiti is a great place to resupply, whereas the Cook Islands and Samoa not so much so. Finally, there is the fatigue factor of getting the boat ready for a long passage and making that transition from being at anchor to being at sea. My decision is made … I will be heading to Tonga next.