HNLMS Marten Harpertszoon Tromp (Dutch: Hr.Ms. Marten Harpertszoon Tromp) was a unique coastal defence ship^{[lower-alpha 1]} of the Royal Netherlands Navy built by the Rijkswerf in Amsterdam.

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History
Netherlands
Name	Marten Harpertszoon Tromp
Builder	Rijkswerf, Amsterdam
Laid down	1903
Launched	15 June 1904
Commissioned	5 April 1906
Decommissioned	1927
Fate	Scrapped
General characteristics
Class and type	Unique coastal defence ship
Displacement	5,210  tons
Length	100.78 m (330 ft 8 in)
Beam	15.19 m (49 ft 10 in)
Draught	5.69 m (18 ft 8 in)
Propulsion	6,400 hp (4,800 kW), two shafts
Speed	16.5 knots (30.6 km/h)
Complement	340
Armament	2 × 9.4 in (24 cm) (2 × 1) 4 × 15 cm (5.9 in) (4 × 1) 8 × 7.5 cm (3.0 in) (8 × 1) 4 × 1pdr (4 × 1) 3 × 45 cm (18 in) torpedo tubes
Armour	6 in (15 cm) belt 8 in (20 cm) barbette 8 in (20 cm) turret

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The ship was 100.78 m (330.6 ft) long, had a beam of 15.19 m (49.8 ft), a draught of 5.69 m (18.7 ft), and had a displacement of 5,210 ton. The ship was equipped with 2 shaft reciprocating engines, which were rated at 6,400 ihp (4,800 kW) and produced a top speed of 16.5 knots (30.6 km/h).

The ship had a belt armour of 15 cm (6 in), 20 cm (8 in) barbette armour and turret armour.

The main armament of the ships were two 24 cm (9.4 in) single turret guns. Secondary armament included four single 15 cm (5.9 in) guns and eight 7.5 cm (3.0 in) single guns.^[1]

Tromp was launched on 15 June 1904 at the Rijkswerf in Amsterdam. On 5 April 1906 she was commissioned by Captain Koster as the first commander of the ship. The same year on 25 June she made a visit to Norway for an official visit to the ship by Haakon VII of Norway.^[2]

10 August 1909 Tromp together with Koningin Regentes and De Ruyter departed from Batavia to China, Hong Kong, Japan and the Philippines to show the flag.^[3]

On 2 March 1920 she and Hertog Hendrik departed from Den Helder for a four month journey to Asia to show the flag. They visited the ports of Singapore, Saigon, Hong Kong, Shanghai, Kobe and Manila.^[4]

On 17 November 1923, the Dutch cargo ship SS Rijperkerk put into port at Bastia, Corsica, France, on fire. Marten Harpertszoon Tromp scuttled the burning ship.^[5]

From 21 June to 30 July 1926 the ship together with Jacob van Heemskerck, torpedo boats Z 7 and Z 8 and submarines O 9 and O 11 departed from Den Helder to the Baltic. During the trip they visited the ports of Kiel, Göteborg and Trondheim.^[6]

The ship was decommissioned in 1927.^[1]