The navy in 1906 consisted of only three small cruisers on the Caribbean coast, and two cruisers, two gunboats, one troopship and two steam launches on the Pacific. There was also one small gunboat on the Magdalena.
The Chapare, Secure and Chimore, tributaries of the Mamore, are navigable for launches up to the base of the mountains, to within 130 m.
Five launches built in the Royal Indian Marine Docks, Bombay, in 1905, at a cost of 6o,ooo rupees each, of about 8o tons.
It is quite certain that steam launches could ply over very long sections of the river above that, perhaps as far as the Kaw ferry, or even the Kunlong ferry.