The Do 18N was use primarily for Air/Sea rescue and were painted white with prominent red crosses. However, it is widely believed that at least some of these aircraft used these markings as a cover to perform ELINT (Electronic Intelligence) missions. Eventually the Do 18 was replaced in service by the Bv 138

Type: Reconnaissance and Air/Sea rescue
Origin: Dornier-Werke GmbH
Models: D, G, H, N
Crew: Four
First Flight:
    Do 18a: March 15, 1935
    Do 18F: June 11, 1937
    Do 18L: November 21, 1939
Service Delivery: September 1938
Final Delivery: 1940
Production: 100+

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Powerplant:
Do 18D:
   Model: Junkers Jumo 205C
   Type: diesels in tandem push/pull configuration
   Number: Two        Horsepower: 600 hp

Do 18G, H & N:
   Model: Junkers Jumo 205D
   Type: diesels in tandem push/pull configuration
   Number: Two        Horsepower: 700 hp

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Dimensions:
Wing span: 23.7m (77 ft. 9 in.)
Wing Surface Area: 1054.89 sq. ft (98.00m²)
Length: 19.25m (63 ft. 2 in.)
Height: 5.45m (17 ft. 9 in.)

Weights:
Empty: 5,850kg (12,900 lbs.)
Loaded: 10,000kg (22,046 lbs.)

Performance:
Maximum Speed: 162 mph (260 kph) at sea level
Cruise Speed: 106 mph (170 kph)
Range: 2,175 miles (3,500km)
Initial Climb: N/A
Service Ceiling: 13,780 ft. (4200m)

Armament:
Do 18D-1:
Two 7.92mm MG 15 machine guns manually aimed, one mounted in the bow and one mounted in the rear cockpit.

Do 18G-1:
One 13mm MG 131 in bow cockpit
One 20mm MG 151 in powered dorsal turret

Do 18H and N: Unarmed

Payload:
Do 18D-1 & Do 18G-1:
1,000kg (2,204 lbs.) of weapons or stores mounted on wing racks.

Dornier Do 18
[Source: Unknown]

Dornier Do 18
[Source: Unknown]

Sources:
Gunston, Bill & Wood, Tony - Hitler's Luftwaffe, 1977, Salamander Books Ltd., London
Donald, David - The Complete Encyclopedia Of World Aircraft, 1997, Brown Packaging Books Ltd., London