standard / repeatedly
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standard
Included as part of the standard equipment of a mass-produced product (especially vehicles), meaning at no extra cost.
Bei diesem Automodell ist die Klimaanlage serienmäßig eingebaut.
In this car model, the air conditioning is installed as standard.
repeatedly
Happening in a series or sequence; repeatedly in the same way.
Der Stürmer vergab im Spiel serienmäßig beste Torchancen.
The striker repeatedly missed excellent scoring chances during the match.
The word consists of 'die Serie' (the series) and the ending '-mäßig', which means 'according to' or 'in the manner of'. So it describes something that corresponds to the series or happens as if in a series.
Die serienmäßige Ausstattung des Wagens ist bereits sehr gut.
The standard equipment of the car is already very good.
The meaning depends strongly on the context. In connection with products (especially cars), it means 'standard'. In connection with actions (often in sports or everyday life), it means 'repeatedly' or 'one after another'.
Das Navigationssystem ist bei diesem Modell serienmäßig.
The navigation system is standard on this model.
In the meaning of 'standard equipment', the word can be used as an adjective before a noun or as an adverb. Both forms are very common.
Die serienmäßigen Felgen gefallen mir nicht.
I don't like the standard rims.
In the meaning of 'repeatedly', 'serienmäßig' (repeatedly) is almost always used as an adverb that describes an action. Here it often has a slightly negative or ironic tone.
Er verpasste serienmäßig die einfachsten Bälle.
He repeatedly missed the easiest balls.
default / standard
Standardmäßig refers to a usual or preset feature. Serienmäßig, by contrast, means that something is part of the standard equipment of a mass-produced product and does not cost extra. For settings, standardmäßig is the appropriate term; for included equipment, use serienmäßig.
Das Navigationssystem ist bei diesem Auto serienmäßig enthalten.
The navigation system comes as standard with this car.
Im Navigationssystem ist standardmäßig die schnellste Route eingestellt.
The navigation system is set to the fastest route by default.
