Mentawai Boat Trip Logistics - Getting to the Spots
Boat travel logistics is an unappreciated aspect of the trip that you don't really grasp until you've been there. This post assumes you're on a boat that cruises at 8-10 knots, and even fast boats can only go fast during the day.
The Crossing
First of all your prototypical 11-night boat trip leaving from Padang really only has 10 surf days. The first night and the last night has you crossing the channel between Padang and the islands. It really does take all night. if the wind is up for any reason, the crossing could get pretty bumpy.
Playgrounds/Northern Sipora
The shortest distance between Padang and the Ments is to the Playgrounds area between Siberut and Sipora. This area is densely packed with spots that work on a variety of conditions. Bank Vaults, E Bay, Rifles, Kandui, Burgerworld, Pit Stops, Chubbies, 4 Bobs, etc. Northern Sipora is nearby with also has 2 good lefts and one epic left, Telescopes. Because this is the typical arrival and departure point for the Mentawais and has consistent spots that work with almost any conditions, a boat could conceivably spend all 10 surf days in this area. This is a risk you take when booking the cheapest trip you can find. However, if you're scoring pumping Rifles, Telescopes, and Bank Vaults for a week straight you'll be too tired to care that you never made it down to Macaroni's.
Southen Sipora
About half a day's motor from Playgrounds, this area has HT's and Lance's, both of which are consistent waves that work on opposite wind conditions. Always lots of boats congregated in this area. Coming straight here on your first day is pretty unlikely since the guide wants to make sure you get some waves the first day and Playgrounds is a sure thing for rideable waves. You could conceivably surf this area on your last day but you'd only get a half day session because the crossing would take so long. Figure you get 8-9 surf days max at HT's.
North Pagai/Macaroni's
From Playgrounds, on a typical boat it takes a full day to get down to Macaroni's. Which means you either miss surfing for a full day or you drive there at night. No waves for a full day is a non-starter early in the trip for the guests. Motoring all night the night before or after the crossing is a non-starter for the crew, or at least a favor the guide can't call in very often unless he thinks it will get everyone a healthy tip. So therefore you cannot spend the first or last day of your trip at Macaroni's, leaving you with a maximum of 8 surf days as far south as Macca's on a typical 10 day trip.
South Pagai
The South Pagai area has heavy duty hollow waves like Rags and really consistent swell magnet waves like Thunders. A typical boat will spend most of a day getting to and from Thunders from Macaroni's, so you're really left with about 6 days max in this area, and those days must fall in the middle of your trip. The area south of Thunders is home to a number of semi-secret spots that require specific conditions, for example the spot where Dane Reynolds got the killer left barrel in Young Guns 2. Surfing magazine outed this spot as "Green Bush", but chances are you won't surf there without taking a longer trip with a motivated, knowledgeable captain. Most boats will not go south of Thunders because it adds a half day of motoring each way and the captains either don't know about or won't chance the spots that require specific wind and swell directions.
Breaking the Cycle
There are a finite number of boats, their schedules are published, and the only real flexibility the guides have is in the middle 5-6 days of their trip. Therefore although it may seem farfetched, it's not that tough for a guide who knows the boat schedules, the current conditions and the spots to guess where the other boats will go and go somewhere else to score uncrowded waves.
Even the lazy will score in the Mentawais
Scuzz of Sumatran Surfariis sold me on a Ments trip by noting that in spite of the 40-odd charter boats, "There are so many 'B' waves in the Mentawais". If you have pumping swell and no wind, then there will be 25 quality waves going off all over the ments, and even with two boats each on 20 top spots you'll still score more waves than your endurance can handle. Given their consistency, Mentawai B waves like Icelands, Bank Vaults, Lance's, or Thunders would be destination waves anywhere else in the world. Getting one of them with just you and your friends out will make for an unforgettable session.