New game. Your input welcome

[plasticpanzers (OP)]

They work fine with the commercial jump drive.  Ships (now C version after some of the suggestions) doing quite well.
Added the AMMs as a last resort defence (forlorn hope) in case they run across hostiles.

Discovery C class Survey Ship    8,700 tons     152 Crew     1148.8 BP      TCS 174  TH 96  EM 0
2298 km/s    JR 1-25(C)     Armour 1-37     Shields 0-0     Sensors 20/28/1/2     Damage Control Rating 6     PPV 2
Maint Life 5.45 Years     MSP 1495    AFR 100%    IFR 1.4%    1YR 85    5YR 1268    Max Repair 200 MSP
Intended Deployment Time: 48 months    Spare Berths 0   
Magazine 32   

JC9K Commercial Jump Drive     Max Ship Size 9000 tons    Distance 25k km     Squadron Size 1
Northrup (25) 5-400 EP Commercial Magneto-plasma Drive (1)    Power 400    Fuel Use 4.42%    Signature 96    Exp 5%
Fuel Capacity 250,000 Litres    Range 117.0 billion km   (589 days at full power)

Phalanx CIWS-160 (2x4)    Range 1000 km     TS: 16000 km/s     ROF 5       Base 50% To Hit
Aegis PD R-1 Missile Launcher (2)    Missile Size 1    Rate of Fire 10
Aegis PD Missile Fire Control FC11-R1 (70%) (1)     Range 11.1m km    Resolution 1

Ship Active Search Sensor MR89-R60 (70%) (1)     GPS 6300     Range 89.5m km    Resolution 60
Hawkeye Active Search Sensor MR5-R1 (70%) (1)     GPS 53     Range 5.8m km    MCR 628k km    Resolution 1
Thermal Sensor TH2.5-20 (1)     Sensitivity 20     Detect Sig Strength 1000:  20m km
EM Detection Sensor EM2.5-27.5 (1)     Sensitivity 27.5     Detect Sig Strength 1000:  27.5m km
Gravitational Survey Sensors (1)   1 Survey Points Per Hour
Geological Survey Sensors (2)   2 Survey Points Per Hour

This design is classed as a Military Vessel for maintenance purposes

[DIT_grue]

They work fine with the commercial jump drive.

IIRC, the rule is supposed to be that a commercial jump drive won't work with military engines, so the Discovery would be fine, yes.

[MarcAFK]

The only problem I have with the discovery C is the resolution 60 sensor seems pointless, assuming you arm it with the Aegis which has 11 million range and is your AMM which makes sense as a self defence missile, you won't be taking advantage of that sensors range. You wouldn't want to add longer ranged missiles either as magazine space is limited.
I see you're using a reduced size res 1 sensor compared to the Oregon, it's better to use the full size one if space is available. But if not you're better off either increasing the range of the res 1 using the soace taken up by your res 60, or what I would do on a similar design which is design a resolution 60 that's 11 million kilometers so your AMMs can be fired at full range against larger ships. You'll save some space which could go towards something else.
Furthermore 2 launchers isn't really effective either as AMM or particularly for anti ship use. As you haven't quite reached the full size of your jump drive you could cram another couple of size 1 launchers in. I would have minimum of 6 for self defence of a ship like that. More magazine space would be useful too.