Seaworthy, roadworthy

[Tomisimo]

Seaworthy: (a boat) in fit condition and ready for a sea voyage (there are a couple of ideas in the dictionary already)
Roadworthy: (a motor vehicle) in fit condition and ready to be driven on the road.

Both of these can be used in a figurative manner as well.

What's the best way to express these two concepts in Spanish?

[chileno]

Listo!

[aleCcowaN]

en condiciones (de/para navegar; de/para volar; de/para viajar); [en buenas condiciones]

not sure about "en buen estado..." because it'd look like it has seen better times, trained or recovered from the flu.

[Don José]

not sure about "en buen estado..." because it'd look like it has seen better times, trained or recovered from the flu.

At least in Spain, you can say that a car is "en buen estado". You can read it very often in second-hand cars ads.

[aleCcowaN]

Originally Posted by Don José

At least in Spain, you can say that a car is "en buen estado". You can read it very often in second-hand cars ads.

Sure, it also applies everywhere else, but you may not say "en buen estado" or "en buenas condiciones" (a general statement) to express "aprestado", "presto" or "en condiciones de/para" (fitting or adequate for specific duties)

[Elaina]

Originally Posted by chileno

Listo!

Yeah for the most part......
-Listo para lo que venga...caminar, navegar, jugar, trabajar, etc. etc

[Tomisimo]

Did some more research and found: (in addition to the options already suggested)

seaworthy = marinero, navegable, en condiciones de navegar
roadworthy = en condiciones para circular, apto para circular
airworthy = en condiciones de vuelo, aeronavegable

[AngelicaDeAlquezar]

I agree with "listo para" and "en (buenas) condiciones de/para".
I usually don't see "en buen estado para".

[poli]

As an alternate listo para, I believe bueno para is often used.

[chileno]

Originally Posted by Elaina

Yeah for the most part......
-Listo para lo que venga...caminar, navegar, jugar, trabajar, etc. etc

In other words "boy scout"!

[Don José]

Originally Posted by AngelicaDeAlquezar

I agree with "listo para" and "en (buenas) condiciones de/para".
I usually don't see "en buen estado para".

It may be one of those differences among the Spanish we speak, but this sounds very natural to me:
... debes tener un coche en buen estado para poder recorrer los casi 800 km. que tiene el Camino de Santiago.

[chileno]

Originally Posted by Don José

It may be one of those differences among the Spanish we speak, but this sounds very natural to me:
... debes tener un coche en buen estado para poder recorrer los casi 800 km. que tiene el Camino de Santiago.

Todo depende del contexto.

Tengo un auto apto para ir y venir a ....

Tengo un auto listo (preparado) para ir y venir a ....

[AngelicaDeAlquezar]

Originally Posted by Don José

It may be one of those differences among the Spanish we speak, but this sounds very natural to me:
... debes tener un coche en buen estado para poder recorrer los casi 800 km. que tiene el Camino de Santiago.

@Don José: That's another sentence structure, because you're introducing the purpose from the start.

·Es un coche en buen estado para circular. (We'd usually omit the purpose, as it's already said it's alright, but it doesn't sound strange.)
·Es un coche en buenas condiciones. ("...para circular" would sound awkward, as "en buenas condiciones" is explicit enough.)
·Es un coche listo para circular. (Purpose is rather indispensable to be expressed.)